Is it normal that my second cousin rejected sex and were dating.? (both girls)

I found out that my girlfriend is Not my third cousin but is my second cousin. But this doesn't change a thing. We talk about sex on the regular and we both really seemed to want to do it. So one weekend we stayed in a hotel together and I was trying to make way...But she told me "I Don't know if I Can Do This." We are Both Girls and it would have been fun to try something new since I'm a virgin. But she rejected me. Even though she is the one always saying she wants to fuck me so hard. Is This Rejection Normal??