House Cat turns into Demon Cat - Became Feral after locked outside over night

Our house cat snuck out when no one was looking. She was locked out for about 10 hours overnight. We don't know if she left our high fenced in yard but believe she did. Something traumatized her because she turned into a demon cat literally overnight.

Blitz used to be a very sweet, loving cat. After her night out on the town, she would not stop growling and hissing at us. It took her just over a week to finally stop hissing at us and about 2 weeks to start headbutting our dog in greeting.

However, she never became friends with our 2 other house cats. Their games of house tag ended the night she escaped.

We hope she will turn back into the sweet little girl we've always known her to be.