Was all of you stuff out of the apt when the walkthrough took place?
Or was something concealing the damage that she missed the first time? (I.e. behind a piece of furniture, under a rug)
Leases usually state that the funds wont be released until the inspection is done, so I wouldnt worry about getting the signed walkthrough paperwork as being the end-all.
To me, her releasing the security (the money) absolves you of liability unless there was some attempt to cover it up during the walkthrough.
But Im an idiot, so lawyer up.
The good news is that youve got the TBD braintrust working on it for you (myself, Exiled, teef, etc) so nothing to worry about.