My cousin who's on drugs stole from me,what do I do?

So my cousin who just had a baby! Asked me to borrow her my flat iron now this flat iron belonged to my mom who passed away not to long ago...it has sentimental value...I had no idea the bitch was still on drugs!! I feel so stupid for even trusting her,I messaged her to give it back but she's been avoiding me ever since,and her mom said that she sold it...I'm 14 weeks pregnant as well so I'm really really angry..I feel like kicking the shit out of her😡...or should I just let it go...