I imagine her situation is similar to Adrian's in that the original soul was kinda displaced and damaged but still present, so as soon as she escapes the original Hilda will take back over and... probably just start screaming uncontrollably? No way she's as resilient as our MC (I forget her original name), & even she would be permanently scarred having to sit & watch helplessly as someone else controlled her body for months to commit murders and flirt with Satan. (Assuming Hilda was just a completely average, religious person, she's probably been screaming internally nonstop this whole time already, IMO.) This'd probably cause Adrian to die from shock, too, so that's fun to think about I guess...