Money borrowed with no agreement in USA - getting threats - Help please

I was in USA sometime ago and had a friend there who I was dating for few months. During the course of time, I borrowed some money from her and it was a bank transfer. Due to some crazy circumstances, I lost my job and given i had some loans etc, all my money was depleted and I could not return the money to this person. obviously there is no more relationship and soon after i returned, I started getting threats from her asking for money . Given my reality in the situation is i had 0 money left all i could ask was only time . This lady is from India and became a US citizen recently. we do not have formal document of any sort apart from bank statement to prove that money was transferred to my USA account (which is currently inactive). I constantly get threats and she has my indian address , phone number etc and ii get constantly harassed . After I returned I have been unemployed and I am currently going through a rough phase. I have intentions of returning the amount but with the constant threats etc, I do not have any incentive to do so... Given I did not use any of that money to get to india is there anything she can do to hard me ? If it was USA I would have filed a harassment/stalking charges against her but given i am here and she is there and claims she knows people and will harm my family etc, I want to know if there is any possible repercussions I would face. again, there are only some whatsapp messages etc on USA number (WHICH I don't use anymore) and no physical signed document. She somehow got address of my parents who live in coimbatore and I would want to know how can I safeguard myself and my family .