Today's change was the first time there was stretchy, sticky stuff when i removed the bandage
Wouldn't worry about the black too much. Given the absence of skin, it's going to take some tissues rebuilding to bring the edges back together, and I think that's what's happening. As long as there's no bad odor or pus looking ooze coming out from it (yellow/green) it's just her cells figuring out how to bridge the gap.