Hey Bethany:
Do you think there is anything else that could have caused it? Since you think you did consume some dairy, I think it would be safe to say it was that.
It could take 48 hours for her body to have an affect from it. Some lo's have a delayed reaction to milk, which is why it is so hard to figure out sometimes.
If you really did not do anything else major, I would say it was that.
Wendy