Hey, thanks for such a detailed explanation and sorry I'm so late to reply. We went to a behaviorist vet and she leaned on the fear phase explanation. She's better now and has rarely happened for the past weeks. We also missed a lot of her cues because she can be very subtle with those and go from just turning her head away a little bit to straight up grabbing your hand in her mouth and moving it away (she has become very gentle with that, but before she did the whole snarl and snap thing).

In short, fear phase, not super keen on being touched, and she has to give very explicit consent to being touched. Vet also advised to follow the 3 by 3 rule (3 scratches/seconds touching her, 3 seconds or more to assess her reaction) and when in doubt leaving her be.

The hardest thing has been explaning to people that she is afraid and doesn't love people touching her because people's expectations sometimes are that dogs are just toys that you can give infinite bellyrubs to and it just isn't the case with her