I suspect the whole story will come out soon enough.
I think she is in a world of trouble.
It’s not plausible that she stole and used embryos, though she possibly could have stolen fertility drugs and frozen sperm. Transferring embryos into the uterus is a high tech process requiring a lot of expensive equipment, professional skill, and near perfect timing. There is simply no way she could have transferred stolen embryos without the full cooperation of both an embryologist and either a doctor or specially trained physician assistant or nurse, and the unfettered use of an IVF clinic’s facilities. There is no possible way to steal embryos and run off and transfer them into yourself or have a friend help transfer them.