I know another member on here does use diapers when leaving her pups at the sitter. It is just a guarantee that they won't mark or have an accident. I think it goes quite well. I would get her used to it before you put them on for the weekend.
Des (Go Fetch) has some on clearance right now
go.fetch™
go to clearance- then panties.
I think most people just cut up a diaper or a sanitary pad and place tehm in the diaper. Good luck