I’m sorry to hear about Ava. Unfortunately, with only “she is off” to and without examining her, I can only make guesses. Fear, anxiety, pain, nausea, allergic reaction to an insect bite, Heat stroke, and others are all possible. Take a rectal temperature. Normal is 99.5-102.5. If it’s 102,5-103.5, watch carefully and recheck temp in an hour. If it’s 103.5 or higher, Id head to the emergency clinic. If it’s normal, watch for an hour. If she’s not back to herself in an hour- or if she gets worse in any way- head to the nearest emergency clinic to get her checked out.