I haven't worked on anyone going through chemo but if her doctor has cleared it and encouraged it for her, I would definitely massage her. I've worked on a number of people who are cancer survivors, but not during treatment. Not because I wouldn't, the opportunity has never come up. I think sometimes our MT training and MT schools have gone a bit over board in telling us who we should and shouldn't work on. I worked with a girl who wouldn't massage a guy who was a type II diabetic because school "freaked her out about it" and told her not to. That's just my thought on it.