Speak to your dad, and tell him that if he doesn't make her stop, he should let you have a lock on your door. It's not right that he lets her carry on. She's clearly doing it on purpose, and there may be one day where it causes you to do more than faint.

Saran wrap across the door, face height, if the door opens outward. If it opens inward, glitter buckets. Definitely tell your dad and if he argues otherwise, record it. Put a sign on your door, stating that for your safety she needs to knock. Film the sign, then film her barging in, and social media it if this crap continues. And if you get hurt, take a few of those videos with you to the hospital and get her banned from your hospital room. Public humiliation has never gone out of vogue.