I’d try someone else, honestly, at best (without even taking into account what Rive. said) she seems very pessimistic and like there’s a lot she just doesn’t understand in general.
Being rejected by your colleague honestly didn’t spell the end of your dating potential, for example (I mean in general, not potential to get with your colleague). Most people get rejected by more dates than accepted, it’s literally just statistics. And many mixed height couples exist, including women with shorter men.
Also, while I don’t know much about schizophrenia, or schizoid tendencies, I’m pretty sure you can’t work through it alone.