If it was a rupture you would of seen fluid and what looks like white "goo".
Normally the abdomen tears on the side when the spider starts molting, then the head part poops off.
can you try taking better quality photos and closure to the spiders abdomen, use a desk side lamp to help with the quality and focusing of your phone.
Keagan, look for movement on top of the head, it will look like a pulsating movement, a heart beat, if you see that then you now she is molting out..
take a look at this video, you will be able to see what I'm talking about.
Source:
Xenesthis sp "White" Molting