First of all, everyone telling you to simply “sack up” or “get over it” are unhelpful and ignorant. You don’t simply “get over” emotions like that.

Here is something you can do: find out what her fantasies are that she has never had the chance to play out before, and play them out with her. You will be the only one she has shared that experience with, and none of her ex’s will have that. That will give you a “one up” so to speak, on her ex’s.

If there aren’t any fantasies she has Herself, then you can suggest some. Toys, bondage etc. But keep in mind that she is also a virgin, so too many of those things might scare her off a little