(((Hugs))), Heather. My first thought when I read your post was teeth because this same exact thing happened to Sam when he was 7 months old. I found with Sam that the tooth cutting through wasn't the worst for him, but when they were actually moving below the surface which didn't translate (for him) into red, swollen gums. Could she be nursing for comfort? I could be totally off base here, but just remember this happening to us and it went on and off until he cut his first tooth (and then when the next tooth would move etc etc).
If it's not and she's just hungry, adding another meal will probably help!
By no means an expert on anything sleep related, really just here more to offer (((hugs))) and support. Hope you can get a little rest today or at least an earlier BT for yourself!