Did her hips thrust upwards and lock?
I don't do that! Different women may be different.
The most obvious thing about orgasms is that she would be really sensitive for about 30+ seconds afterwards. Just like you are. She would try to stop you for a minute if she really had an orgasm then she should be predisposed to having another orgasm after you start up again a minute later.
For me, only sometimes, sometimes I can come again in a minute or two or five. It depends.
It's complicated!