This girl stole from me and I want to get what she stole back but she won't hang out anymore. should i just..?

forget about it? She's not a good person to hang out with because she just smokes all the time and is just messed up. She hangs out with random guys and got raped. But i just want to get my stolen thing back. Maybe i'm just ocd..ahh what should i do? i tried to get her to buy me somethin and said i would pay her back (for the same price of what she stole) but she always says she's busy. i should probably forget about it i guess but it just bothers me to let people get away with stuff like that. it's annoying when someone takes something from u and u worked hard to pay for it in the first place.