How would u ladies feel ..

Ik they say not to make friends at work but one coworker of mine & I ended up being good friend. I took this female out to eat , I always give her noodles for lunch & today I was reimbursed $120 for my test & put my $ in my lunch bag . Anyways my co worker put her phone in my bag & out of no where 20$ was missing .. i don’t like pointing fingers but this female is the target bc she’s always wanting $ , saying she’s broke etc etc but yet all she does is eat outside food & spends it on stupid shit . Well I asked her and she says idk .. and on top of that my chocolates were open & some were gone 😩she has that guilty face look like I’m so pissed bc she even considered herself as my friend .. now it’s just awkward & shady .. am I overreacting?