It would seem unlikely that Abby would have killed Andre and blamed it on Gabby, her best friend and stating how much she loved Andre. How could she have known about the security systems being shut down & plan the crime at that time. It still seems that Stefan or Vivian planned it & unlikely that Abby helped them.
but how did she know where the bloody urn was in order to put it in Stefan’s room? I think she is being manipulated by someone, probably Vivian, maybe by tampering with her meds ( I assume she is on meds, lol).
Before the murder Abby came into Stef’s office and dropped something. After she left he picked up the item which was her security/pass card. So we don’t know what he did with it before he returned it to her. That has got to have something to do with this mystery.
her head starts to hurt and then she changes. Possibilities could be a brain tumor or mind control. No one dies from brain tumors on soaps, so that’s a possibility. However, Vivian said she had a plan. Maybe she knows how to do some mind control things and she was able to get Abigail to turn into Gabi and then kill Andre. If Abigail did it while she was Gabi, she’d never remember it.