I proved with my own eyes that a "friend" has my phone that i lost about a month ago, i want to rip her apart!?

Do i go right to her house and call her out onn itl, or do i let time pass and get her when she doesnt expect it, for example, hang out and when she least expects it, turn on her, beat the **** out of her and get my phone back? im really pissed off but i gotta do things right. Please advice on how to handle this situation.