My ex girlfriend still hasn't given me back my ring. I tried blackmailing her but that didnt work. help?

My mother gave the ring for my seventeenth birthday and it's very dear to my heart. i gave it to her for her 19th birthday bc mother told me to pass it off to someone special. We broke up almost 2 weeks ago. well she broke up with me because she thinks im cheating. i never cheated on her, but she always accused me of cheating because she's so insecure. So i said i wanted my mother's ring back and she said she would mail it to me. Ive told her numerous times over the course of the two weeks that i needed the ring back and i still havent recieved it. I don't why she's still holding onto it. She said it was ugly. this is a sentimental value to my family. and it hurts that it may possibly be gone forever. i told her if i didnt get the ring back i would leaky kinky texts that she sent to me to her beloved mother and father who are indeed strict. She wasn't even phased. She just had a smirk on her face the entire time. Anyways, i've been calling and texting her and she has been straight ignoring me. I even stopped by her house but no one answered the door. i don't know what else to do? anybody? help?