I am in the exact same boat with my 9 month old. I wish I had a magic solution, but unfortunately I think it's one of those things that the only way through is through. It's frustrating and exhausting but it won't last forever (it is hard to care about that at 3am though, I know). Does she know how to get back down? Mine doesn't, so that's the only practical advice I have is to help her practise during the day so that hopefully she won't do it at night, or at least can lie herself back down and need less intervention. I wouldn't feed her if you can help it. Maybe once in the early hours if it gets you a quick resettle, but definitely not multiple times a night at this age.