Anything is possible. I dated my husband long distance for 6 1/2 years; we had our ups and downs, including a breakup. It worked because we were committed to each other, always focused on communicating, and gave each other enough space in the relationship to feel comfortable.
It's unfortunate that you've had such a painful year, and I do hope things get better soon.
Breaking up, reconnecting, getting back together - it's all overwhelming. My advice is to take a step back, truly be her friend, and see where it goes. Ask her what she wants from the relationship, no pressure, no expectations, and accept her response - even if she wants to break up or just needs more time/space to process her own feelings. Saying she has nothing left to give you doesn't mean she doesn't value the relationship. Maybe there is something she needs from you.