A Kinnar Did Not Accept my Money and Gave it Back. Is it Good?

Today a strange thing happened with me (M36). In the morning, my doorbell rang. A Kinnar was at the doorstep asking for money. Usually, I don't entertain these people at my door, but on the second thought I offered to give her Rs. 21 as a charity. She took the money, murmured something and then bite the coin, wrapped it in the 20Rs. note and returned me. She said this is a Kinnar's blessing and it is very powerful. She also instructed me not to spend it ever and keep it safe wrapped in a white cloth.

This is the first time I have experienced something like this. I am scared, nervous, positive at the same time.

What does it mean? Is it good? Should I keep the money that she returned or discard it ceremoniously?