While my experience of this is and will remain limited to the two-parter and the explanation of who she was, if she does indeed have Merlin syndrome (she lives backwards through time), *she already knows what's happened*. For her, there's no hoping about it - it's happened, now it's over. It's all in her past and his future, just as at some point later on it'll all be in his past and her future. She doesn't have a romantic future with the Doctor from her perspective, but she does from his.

Of course, this does assume that she's living backwards through time like T S White's Merlin (or Rachel Weintraub in Hyperion).