Curious about this because:
1. Betsy did not "steal" Kwannon's body. The body swap was performed by Spiral at the request of Matsuo (or maybe Kwannon's boss, not 100% sure)
2. Kwannon died from the Legacy virus and the portion of Betsy's telepathic powers bonded to Kwannon returned to Betsy
In Hickman's relaunch, Betsy not only feels guilty for "stealing" Kwannon's body but Kwannon also states she was aware of Bestsy possessing Kwannon's body and unable to do anything.