And more photos taken, same photos, and extra photos of any damage.

Those are the hardest to notice because they dont cause any damage and drain normally.

(Damage, but no injuries fortunately.) 

While I am still having significant responsiveness issues, the quality of the listing and this new PM’s understanding of market rates is significantly better than my previous PM.I’ll note that during this time, there had been 2 hurricanes in surrounding markets (fortunately no damage to my property from either) that likely contributed to some of this vacancy.

I cannot sell because there was a break in and a lot of damage.

Long term I think you end up losing your shirt here, so if you can get out without too much damage I'd take my lumps and move on.

Since RAD has someone on the forum they can respond to this, my question would be you make some pretty damaging statements there, do you have any dates etc. you can refer to like the cookout at XYZ on this date or the party at ABC on this date or ABC drives a blank model company car...

Best practices for security deposit deductions (damages)?

It appears you are able to hold her responsible to cover damages and lost rent.

The other option is a water supply line, but that would typically resulting a steady leak and the damage would occur faster.Really think about what is above that space that could cause the issue.