I have a type of uterine cancer, too, and had to wait a month just for an office appointment with a gyn-onc surgeon after the diagnosis, because my HMO (Kaiser) needed to refer me out of network. Then another few weeks for surgery.
I think the endoscopy (I had a hysteroscopy) is to get a good look at what's going on and take biopsies. It will help guide surgery, but also give them a microscopic look at what's going on in her tissues. Surgery will help them "stage" her and determine what further treatment is advised.
I know the waiting is awful. All you can do is try to be there for her. My sisters (who are at a long distance) sent me fun and encouraging t-shirts, one sent a bell so I could ring my husband (Stinky the Clown) for assistance, and all have been in close contact.
Hopefully she will have news soon. Please keep us posted. 
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