Loan of P10k, with no collateral

Hi good day, i would just like to inquire about my problem.

Sometime in June 2010, I borrowed a P10,000.00 from a lending, a friend of mine as a guarantor, or she referred me, (5/6) with interest of P2,000.00 per month. I was able to pay the interest on the first month, but unfortunately up to now,I failed to pay the same. my company closed so I have no income. Since I trusted her, I left a document of my property (Deed of Donation in my name),on a personal leval for safekeeping, not part of the lending transaction, I just left it with her, and I will get it when I have time. Since I wasnt able to pay the total amount as well as the interest, my guarantor paid it for me. When I drop by her office lately, I apologized because I failed to fulfill my promise. Granted that she will be angry with me and I understand. But when I ask her that I will get my document, she refused and hold it as a collateral of my unpaid loan. Is this legal? That document did not form part of the credit I made. I personally left it to her for safekeeping. Does it guarantee that since she paid my debt, she has the right to refuse to return the document to me? Please advise.

thanks

if i were her lawyer, i would argue that you deposited your documents with her as a security for your obligation to her. can you prove otherwise? it's the reasonable conclusion.