Well @Random_Passer-by it might be due to the trauma of her first time. There's a female sexual dysfunction called vaginismus that matches her problem, although one of the main simptoms is pain wich she doesn't have (up to this point in the story). Some doctors have proposed that this variation...
Hahaha my brain does the same thing whenever there's a blackout or the internet is down:
Me: Can't play games now...
Brain: Then watch a movie or something
Me: OK... ... ... ... shit...