I think more or less this is what happened which caused a spit up of the water that she drank 45 seconds prior which was then inhaled hence the brief foaming and drooling.
I've been checking on her like every half hour / 20 mins since. She's came out to bask a bit on the hot side and then made her way back to her hide box. her tongue flicks / jaw alignment / breathing and demeanor are all back to 100 percent.