Has she every felt like this before if so when and did anything(drgus) cause it. If not then I would say it is either due to caffeine pills(altered due to dehydration), Ex or candyflipping(X dipped in LSD), anyway O2, 250ml fluid bolus, EKG, 12-lead, you can try Narcan but if it is any of above probably wont get a reaction unless the ex was cut with heroin. Also call LEO they may want to investigate.
Also how long ago did she take the pill, is the person who gave it to her still there, and do they still have any pills left for testing at ER. Also where did she get her drink, is it in a can, bottle or open cup. If it is a can or bottle was it open before she got to it. Was it an open cup sitting on table, did she fill the cup or did someone fill it for her. Also scan the scene do we see any tell-tale signs of drug use, glow-sticks, drug paraphenalia, any weird smells in the air.