Speakeasy generally refers to going to a night club and drinking/partying/whatever other things go down.

So yes, it's possible she was on a drug, however, why surpass the possibility of her simply being drunk?

To me she looks like a girl who's had a bit too drink and this explains her "bizarre" movements. I don't think her movements were that odd, considering the times when I myself have been drunk. If someone were to videotape me being drunk I would look like a lunatic to some, and possibly be considered to be on drugs. However, drunk people do drunk things, and drunk things include being overly dramatic with your movements, off balance, ect.