keeping deposit due to negligence?

[Casey S.]

So my last tenant moved out Sunday. I got the keys from her and looked around the place and the bathroom floor was soaked. She said "oh I think that toilet is leaking". Upon closer inspection the A/C drain was clogged and had been that way for a while by the looks of the MOLD all over the baseboards and sheetrock. Luckily it drained towards the tile in the bathroom and not a carpeted bedroom. I know it is my responsibility to make sure the A/C drain isnt plugged but what financial responsibility does she have to report a very obvious problem that caused damage due to her not reporting it? Do I have a legal right to deduct money from her deposit? We have the standard Texas lease that most foks use which states under 17.A.(13) promptly notify landlord, in writing, of all needed repairs.