You need to get a lawyer. I have very limited understanding of this, but you can probably get I think it is a Class III license. What you might want to look into also is a "gun trust". I don't really understand how it works, but I believe it is quicker. I think at the moment getting a license is taking around 15 months or so I have heard. I do not personally have one, but know a few people with full auto firearms. It is do-able, I would just wonder what is the ATF going to say about that Bren in the interim? If she doesn't have a license it might make things even trickier.