girl that haven't had sex for 6 months - how much time to reach orgasm?

Hello,

I've been with a girl last night , she hasn't had sex for about six months now. We began from a little foreplay, and I began 'fingering' her and she maoned very hardly(screamed actually), and then after a while she stopped moaning, even when I penetrated her (maybe my penis size is too small? though it's not shorter than average, definitely not shorter than two fingers, and is thicker). I don't know how to tell if a girl is having an orgasm, so I thought to ask if it's possible that she got an orgasm while I was fingering her ? can it take 5-10 minutes for a girl who haven't had sex for about six months ? maybe it should be mentioned that she told me she was very turned on that night,way more than usual..