Ahh, she sounds as though she is doing extremely well.
It was the same for me when Isaac was born early, although he was a good weight he didn't feed well at all. I only found out the night before that there was a possibility that he could go home the following day. Even then we had to wait for hours before it was confirmed.
Once they are happy that feeding is going well, if that's the only issue then she'll be home in no time by the sounds of things.