@MotherofHeathens I hope you're telling the buyer where to go!
I assume she's paid for a separate valuation which proves she's 'overpaying' for your house? And all the reductions are because the survey placed them at level 3 (immediately requiring work)?
I'd refuse to negotiate if the points above aren't proven and give her until the end of the week to confirm she's continuing at the agreed price.
We renegotiated after our survey as the entire thing came back as a 3. We'd already guessed most of them would be but there were a few shocks. Plus we found out it's flooded before. We reduced by £10k but it will cost us a lot more than that to put everything right.
Still waiting on exchange though (months and months of waiting) as our buyers are ridiculously slow. So could all be a waste of time.