I recently had sex with my girlfriend for the first time. She's the first person I've ever been with, so I'm more than a little bit clueless. She was really wet and there were a few times when I was fingering her that she sort of, well... gushed. It was clear and colorless, a little sweet, but it didn't really smell like anything. But it was a lot of liquid. I'm assuming some women are naturally wetter than others. Is it just that for some women that wetness all kind of comes at once? It didn't happen to me when I was receiving. I didn't mind it at all, but she was embarrassed that we had to change the sheets, so I didn't want to ask her about it. (We have a very open relationship as far as communication goes, and she knows I'm completely inexperienced, so usually if I have a question I just ask her.)
She may have ejaculated. Some women do and others don’t. Reassure her that it’s ok with you and enjoy that she gets so turned on. You could stick a folded towel under yourselves or get a sex blanket to avoid having to change the sheets.
Where she was at in her cycle probably contributed as well to the general lubrication of the area then female ejaculation as stated above.