I believe she is moving out currently and I already have someone who wants to move in immediately after she vacates.My question is, do I need to file again for writ of possession and go through that process, or is there a form or statement I can have her sign that says shes going to be moving out and that she is forfeiting the lease? 

So the banks have no obligation to pay property taxes after they have foreclosed and take possession of the property?

If Bob forecloses, sells, what ever, and then the property is brought to come back into his possession at a lower value (remember Bob has that 100K attachment) then Bob could have some explaining to do, AND the ones who conveyed that transaction.

Sure, you could sue them for "waste" after you get possession and tally up the damage, but you are unlikely to ever collect on the judgment.

The buyer gets possession, but the lender holds the title until the contract is satisfied.You can also do a wrap, aka an AITD (all inclusive trust deed).

Possessing a deed doesn't really signify anything.On a car a TITLE is an OWNERSHIP document and (AFAIK) in every state the TITLE must be signed and surrendered when the vehicle is sold or otherwise transferred.

Now the subordinate liens (the second and third) have a right (like everybody else) to bid at the first lien postion's foreclosure auction.Also, if no one bids on a second lien, then the second lien holder will take over title and possession of the property subject to any superior liens.

Just last week the tenant got arrested in front of the house (allegedly on narcotic & gun possession) & now my client really wants them out. 

Currently have five. 3 paying regularly, one about to pay off and one I had to foreclose on that I'm taking possession of in about 30 days.

Write up a simple letter for the tenant to sign (along with you also signing) before a notary that agrees to a "voluntary surrender of possession".