Very first thing you presume that you have lost your money and you will be fighting a lost battle. So start fighting first by sending her a legal notice to repay the loan advanced by you to her otherwise you will be compelled to take civil/criminal legal action and after getting her reply or not getting reply in stipulated period file a criminal complaint with Police Commissioner/Superintendent of Police of the area where your daughter-in-law stays. Your stand is simply you advanced loan to your daughter-in-law which she is not repaying. She was advanced money with trust that she will repay, therefore she is accused u/s.417, 418 & 420 of IPC (cheating) and 406 (breach of trust). You have to file private complaints against her at magistrate court and civil case for recovery of money for which you will have to come in person at least for few times.
Your case is very strange. I observe that in such circumstances you have not mentioned what advise you have received from your advocate on your matter or simply a cricket /football game is being played on this forum. I see that as being a FREE forum, this is a sort of time pass place.