Oh no...that stinks.
I'm glad you got her in before it got any worse! Why would sutures tear loose that easily?
I guess things like that happen from time to time, though, statistically speaking. Just unlucky that it had to be Tweek. :-\
I don't know... it was real swollen, that might have caused the sutures to tear.... could be it was a less than perfect job to begin with.
Poor thing hates bein' at the vets.