I wouldnt worry about it, sounds like she just came to me or was lubricatng herself like the others have said.
A little personal info 4 ya.
Sometimes when my bf and I have sex that happens to me. There are times that I soak everything and he can feel it running down his sides and the bed is wet after. Its a good thing, it means that she is relaxed and enjoyig herself. Nothing to worry about, enjoy.