She can't win whatever she does. If she focuses too much on her medical team people will start complaining that she got a top private team and not NHS etc.
I don't think she should suddenly have to start being a top cancer campaigner either. Just because you go through something doesn't mean you necessarily want to focus your life and work around it in the future. Some people do and that's great for them, but some just want to put it firmly behind them. Chemo is chemo, cancer is cancer, she has clearly been seriously ill and I imagine they felt they came close to losing her at a point, she has obviously been through the ringer and if she wants to never talk about it again then that's a choice she is allowed to make. I think there is a pressure these days to be 100% open about your trauma or experience when that isn't what helps everybody
Would her being open and a key cancer campaigner be amazing and probably do a lot of good? Absolutely. Should she have to just because she's been through it? Absolutely not.