Toddler anger management

LO is not so bad in throwing tantrums anymore because she’s learning good behavior gets no one in a bad mood and she gets her privileges taken away. She’s 2.5

However, once she’s at the point that it’s not going her expected way with something, she goes nut within seconds. Ruining a nice family trip, or at the store. If I try to calm her down it gets her angrier. And if I tell her, I’m leaving she can stay there, it makes her angrier.

Talking to her is not possible at the moment and I don’t know what else to do expect grab her out from the place and go in the car and drive home, angry and upset. Any ideas how to diffuse the tantrums quickly?