[Brandye]

The rim of either the single-use or reuseable cups do not contain a spring as does a diaphragm. The Instead is quite flexible and is solid polyurethan. Not very strong or rigid. The Instead fits over the cervix and holds itself in place by natural adhesion.

The reuseable cups are either latex (Keeper) or silicone (Luna, Diva) and are less flexible than the Instead. They are still quite easy to fold twice. They are held in place in the vaginal canal by muscles and are sealed against the walls with annular seals around the outside rim.. Look at their websites for a view of them in place.

With the problem she is having, it needs to be pushed in much further and the rim then distributed around the cervix. This takes some digging. Lube will make the problem worse. She is not clearing the muscles around the vaginal introitus.