You have some great suggestions here. One more think you could try is for her to do some bodyweight squats, but facing the wall. This is an exercise I have clients do when they first start with me and it’s also a great warm-up and stretching drill especially when doing kettlebells. She can start doing these squats about 12-20 inches from the wall and then gradually decrease the distance to wall (maybe after every 10-20 squats until she gets almost toes to the wall…this might take some time). It will be more helpful if she perform these without shoes and it will also help her with her flexibility.
I hope this helps.