I'm not a huge fan of terrorists being put in with the general prison population, they tend to radicalise others
Well, that's a general problem with prisons. Locking lots of criminals up together tends to make them better at being criminals.
Put her in a normal women's prison and make sure her cellmates are psychologically stable.
Considering that Islamist ideology is rather unappealing to women, from a self-preservation point of view, I don't think she'd be able to radicalize anyone who isn't even a Muslim to begin with.
Much more of a problem with males, the male supremacy thing is probably going to appeal to them.
(Also, I don't think it would be worth the effort to build specialized prisons for female terrorists. There's already not enough women's prisons to give female prisoners equal opportunities with male prisoners, as there wouldn't be enough female criminals to imprison there.)