Well, she woke up at 3:00 a.m. and I tried to nurse her. This time she didn't even bite me. She looked excited to nurse, turned her head towards me, and then cried and turned her head back. When I managed to calm her down, I tried nursing sitting up so that she wouldn't have to turn her head as much, but that didn't work. Husband gave her a 4 oz bottle, which she took quickly and went back to sleep.
This morning, it was more of the same.
My hope is that this is teething and that things will return to normal soon. But it makes me anxious.