I didnt worry when I came home because she has been inoor/outdoor in the past and she is never gone long or far from home.
Snow had a cesarian delivery, right? And the vet didn't want to spay her at that time?

Hon - if she is not spayed, even "never gone long" can be long enough!

Is she a difficult kitty to keep indoors? Is she a 'sneaker' when a door opens?

Hopefully she'll be all too happy to stay indoors, until her spaying and afterwards. I'd hate for you - and her - to go through this scare again.

HUGS!