also i would not leave her alone in a strange place with no one in room right now with her health being so fragile. I would recommend taking a family member with you she likes and have them stay with her while you are at the wedding
oh and i called my friend with AAI dog as she went through all the neurological testing for kiara, aai, gme, etc and she said the cry and laying on belly her guess is it was a seizure
Is your dog having any pain in the neck area like she is sensitive to touch in neck area as that is real important to know as well?