I just figured it out and uploaded a video of her when she was acting normal for a very short period of time today in the other post. But here is the link IMG 5664 - YouTube
The vet just keeps pushing the fact that they want an MRI because basically they dont know and are not sure, and that was for BOTH vets that we visited today. The first one kept her there from 9-11 on IV and the specialist that we took her to just pushed and pushed on the MRI. But then went on to tell me how dangerous it is for a weak, small chihuahua for an MRI and can possibly die during surgery and you are still required to pay etc.
I am thinking about searching for a holistic vet somewhere near us to get a different outlook on this before putting my dog through all this stress and a spinal tap and mri etc. I also am going to contact my friend who is a breeder her mobile vet tomorrow and he will come by the house and observe how she is acting.