unsure about supposed neurological problem

My girlfriend woke up at 5am this morning and couldnt feel her hands or use them at all...after about 2 mins she couldnt speak...any time she tried to tell me something it came out as a moan...2 mins after that she couldnt talk at all and she doesnt remember what happened after trying to tell me she couldnt talk until she came 2 at the hospital...she started drooling at the same time that she couldnt talk at all...the doctor is unsure of what could cause this and mentioned that it could be seizures, migraines or some other kind of neurological problem...shes never had a seizure before or a migraine but her little sister started getting migraines this year and there isnt any family history of neurological disorders...she used to be depressed and has attempted suicide once...on tuesday of this week she couldnt feel or use her right arm but that went away like she just slept wrong and she just felt like crap the rest of the day after throwing up twice...and yesterday, friday, she woke up and couldnt feel or use her entire right side and i didnt know anything about it until she was up and moving around again like nothing had been wrong so i assumed maybe we needed a new bed but after today im thinking it could be more severe...shes 19 and the doctors have run tests for everything that this could be except neurological disorders b/c they dont have the equipment to do any of that...and by 7am today she was back to being coherent but couldnt form a full sentence....by 9 she was able to do everything like nothing had happened...please help and if you cant thanks for reading anyways...