She's plain and simple broken down.
She lost her spirit and motivation during her time in the original world, and once you're caught in that deep negativity pool it takes a lot of work to muster any willpower at all.
I recognise a lot, even if we arrived at the despair differently. It's not something that's easily resolved by trying new things, because once your mind is dug into negativity, it takes a lot of effort both external but more importantly internal to get back any normalcy. Thoughts like "no matter what I do, it'll be a failure, I'll never be any good at this so why bother" and such will be really persistent and suck out any energy you have. People trying to cheer you up or drag into activities will feel immensely draining as well, because you'll perceive it as a hopeless endeavour and feel like you're wasting their time.