Reading the original post I thought the woman was actively convulsing...
I agree with CBEMT, it could very well be a distonic reaction, however the drugs she's taking don't cause such reactions...
On the basis of the assesment and futher infos my workin diagnosis is hyperventilation crisis due to a stressfull situation; I would monitor her, try to reassure her and transport to ED. I would stay away from pharmacological sedation, particularly with benzos (who the hell prescribed her Oxazepam anyway?! ) and only try to calm her down talking to her.
I'm at loss here...