Mitigate with deposits and enforceable lease clauses. 

I use a combination of Baselane for banking, bookkeeping and collecting rents and security deposits.

We charge a non-refundable deposit and then a monthly fee.

Any suggestions on how to legally put Damage Deposits into a CD to gain interest? 

Were any of the repairs something that should have been deducted from the previous tenants security deposit? 

Otherwise, it may be worth losing the security deposit if the house is in really bad condition. 

So, to answer your question, if it is simply a payroll deposit, that is sourced funds and you have no issue using those  funds. 

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

The only out of the box solution, is to use her deposit this month, and increase her rent $50-100.

You have to have a system set up for vetting guests, creating leases and collecting deposits and rents.