I like your videos. Keep the drills going man. As a smaller man at 5'7" 160lbs or less who also is a lifelong martial artist with multiple 5th dans, I think I can offer a couple of suggestions that might be helpful:
Change the head grab or insert a groin strike prior to the head grab takedown. The reason I would suggest that is because she's smaller and women tend to possess inferior upper body strength which could make a life and death or raped and not raped difference between themselves and a large male like yourselves attacking them. She should devastate targets that are closer to her, lower on her adversary and harder for him to defend. Testicle shots, inside ankle stomps, knee wheels, leg stomps, trips, liver and kidney blasts, sternum throat and eye blows etc etc [careful on the throat and eye shots like bil jee because the higher she reaches on her adversary the more disadvantaged she is and the easier it is for him to note the attack and thus defend it ] should all precede high percentage takedowns more amenable to her size and taking advantage of a woman's hip power like: single and double legs, kouchi kosoto harai and ogoshis, irimis [ not yet irimi nagas, just the irimis in conjunction with the strikes that you taught her to displace her attacker damage him and allow her to escape], and various trips and push offs that we can get from a combo of say wing chun's traps low line kicks and wrestling/judo/tai chi/aikido trips unbalances and displacements [inclusive of foot sweeps and foot stops].
Once you decide what blows you can teach her that can be aimed to say the groin and other more accessible but high percentage high pain targets, and once you decide upon the alternative to the head grab [ or the "takedown B" tech in case the head grab takedown doesn't work; you're the instructor, you know your client, and I am in no way trying to imose upon intercede in or superimpose my opinions and training model upon you ] you simply insert it into the drills that you are already doing. This way you get to keep that all important muscle memory up you've already built up in her, you just are functionalizing it even further. And then you start setting say 3 minute rounds wherein she has to defend your attacks and respond with the drill that you taught her and get say 45 reps done prior to the 3 minutes being up. That's about 1 full rep inclusive of the takedown every 4 seconds. You, sir, are gonna take alotta falls, so I recommend that you both pad up and alternate with say a heavy bag or B.O.B. because not only will that save you a pretty fair number of bumps and bruises, it allows you to step back and correct her technique, foot and hand placement, eliminate telegraps, etc etc.
After a hour or two of this kind of training, you increase the intensity of your resistance to her. You attack from different angles. You attack her from the back. You start her reacting defensively from a rear bear hug attack which she must defeat using the same drills that you taught her just modified for this situation. Then do it again from her back. And then once she's comfy there? Link the new positions to her original position. Perhaps you attack her from the side and in the process of dealing with the scramble you two wind up face to face like you did when you first showed her the tech or perhaps you tackle her to the ground, she fights you off using the same drills you taught her just modified for the ground and then as you two scramble to your feet she repeats the drill standing against you. Maybe you sneak her from the side and press a wooden knife against her. She uses her drill modified for this situation, disarms you,engages you standing up as you two scramble and jockey for position,she does the original drill again and then she escapes. Etc etc. You get the idea you can take it from here.
I realize that what I recommend is for some people alot of work, but it will pay off immensely and quicky. I am not kidding when I say that 3 hours of this training will yield a giant difference in your client's physical fitness and technical ability. I recommend that you have her put in no more than 7-10 rounds at 3 minutes apiece when you train, and have her rep it out on her own when you're not with her directly. I do this all the time with my clients and I get results that are night and day in less than 8 hours of such training every single time. No matter what they want to achieve. You will too. I also tend to start my newbs out with 4 rounds of this tops. The physical energies expended are quite significant at first, and she will definitely feel it the next day. But as her body adjusts [ usually about 4 training sessions, and recommend that she take Glutamine the natural amino acid which will vastly accelerate her recovery rate] to the new stress levels, her techs and her physical fitness will skyrocket to new levels.
Good luck and please tell me how it goes if you decide to employ any of the suggestions above.
