This is called an imperforate hymen and would need to be opened to allow the blood flow out
Worse,she may not even be aware that it has broken because unlike what we believe, it does not always cause pain
Also, the hymen wears down over time, becomes thinner.
But society has given the hymen, the sole responsibility of proving who a virgin is and who isn't. Society also believes that the first encounter must be painful. Wrong
1. She's anxious or scared. Common reason,this makes the muscles around the vagina tight and can make penetration difficult.
2. She's not lubricated enough, same as 1.
The anus does not have the same architecture as the vagina which can lead to more harm and transmission of diseases