Something you could do, pack the small stuff, like you'd be leaving for the day, and then when she gets back she knows your serious.. Then you just go back to pick up the big stuff later.
Confronting her sounds like she'd go on the defensive, lie, and it could possibly become a screaming match, which isn't worth it, though, especially if you already feel she'd throw a diversion if you called or texted her now.
I'd probably pack the small stuff, sleep somewhere else tonight, then when she wonders where you are, say you saw the convo and pics and you're out, will be back later for the rest. That puts the ball in her court and a chance to explain herself.