[Trish]

Seems you are sounding better which is good. It is very hard being the parent of someone in this situation. I don't think the evidence about "brain training" is that clear cut for "Chemo Brain" or even for Alzheimer's for that matter. If she enjoys the exercises then it's fine but it wouldn't be good for her to feel pressured into doing them if her energy is limited. Chemo tends to be cumulative so gets more difficut as you go along. She may be best to concentrate on what makes her feel comfortable and that may be her PhD work and her horse riding. Remember chemo is a marathon not a sprint-for both of you! I hope your back is letting you spend some quality time with your horses.
Take care, Trish