What can you do with your weight?
Rely upon the weight of the pelvis, legs and buttocks. Sitting on the attacker at your first opportunity.
Sitting is psychologically satisfying for the woman and can send a variety of messages to the assailant - all of which are demoralising.Done properly, the attacker cannot get the female student off.
The key thing for a woman to consider is that they must become very comfortable with being on top.
This may be unfamiliar, but in self defence you never want to be underneath your assailant.