Hm, I thought true night terrors only happened in kids, and they have no memory of it happening. Like they could seem awake and be screaming and upset, but the next morning, there would be no recall. Where with nightmares, you could remember them. So maybe she's having nightmares and they just seem real, like she thinks she's half awake but is actually still sleeping? I think SSRIs can cause more vivid dreams--not sure how recently she started taking it. Might be good to have her go in for a few counseling sessions to help process the cancer diagnosis and figure out if anything else could be going on?