Disposition of deposit: estimates ok or actual cost only?

[Mariah Porter]

I had a tenant cause a serious plumbing blockage by flushing tampons down the toilet. This resulted in a $1500 plumbing bill and damages to a downstairs bedroom. She moved out over the holidays before I had figured out the cause of the plumbing blockage and back up. I now know that she is responsible.

I will be sending her the disposition of deposit but am not sure about the actual cost of repairing damages to the bedroom. It may take a while to get the repairs completed because most jobs around here are being scheduled several weeks out.

Do I have to wait until the work is completed to include actual cost in the disposition of deposit or can I put estimates instead? I am concerned if I have to wait until the works gets done I won't be able to send the disposition of deposit in the allotted time. 

I have done some research into the laws in my state and haven't been able to find anything that definitively answers my question.

I really appreciate answers from those with any knowledge on this circumstance. All of you in the bigger pockets community have helped me so much as I have navigated some difficult things that I never anticipated experiencing when I started out on this journey less than a year ago.

Thanks in advance!