Hmmm. Not sure. I would still think she's distressed and finding comfort there but I dunno. Have you considering contacting a behaviorist?
I have talked to the ones at the shelter I volunteered at when I was going through a serious problem with one of my cats...
Here is the email address:
behavior@treehouseanimals.org
I doubt you'll want to call because they are in the states but just in case here's the number:
00-1-773-784-5488 ext. 300