That was very weird, not sure what could be happening to her. Could be TIA, could be epilepsy, Parkinsons, any number of things could cause tremors, but that was so very pronounced.
'sciatica' (not drunk)
She looks like she's on the verge of heat stroke. Dehydration and over heating can cause muscle spasms, balance issues, and discomfort (shown by her hands clasping and unclasping).