An update:
I was able to get her in to our vet this evening (Friday). She wasn't concerned about the hole, partly because it was smaller then before, and very little redness, but mostly because the internal stitches were still fine. She outfitted us with a soft collar, which my little Tiffany just loves, let me tell you. I think I might finally be seeing some of that infamous 'tortitude' everyone keeps talking about. But all in all, I am hoping for the best, and with her not being able to lick her stomach, or do much beyond walking in to walls, I'm sure she'll be okay.
I want to thank everyone for their kinds words of support and their advice, it's mean a lot, so thank you!
Cheers!