It's not backing off - it's giving her read more nuance. As scum, she would probably want to continue discrediting you, because it demonstrates her not going with the thread consensus and gives her content to engage with. As town, she wants to solve, which this indicates. As far as I can tell, she hasn't received significant pressure due to suspecting you, so there isn't really any incentive for her to retract her scum read as scum, and if she were going to retract it, she would probably actually retract it, not maintain it while offering some further consideration on it.