I'm thinking the same. Also if you are managing to remove some of the stitches that could have had something to do with it - though I think you are doing the right thing slowly taking them out as they look ready.
I am just shocked by that....I've never ever heard of a vet refusing to treat a cat! I feel like I should hug you right now, you are such a champion.
If it was just a small amount of blood it's possible she strained herself and tore the wound a little bit. Is the hole getting smaller?