Re: something's not right
I'm sorry you are having problems with your daughter. I know this is hard, but try to just observe her, that way when you go to a doctor you can answer their questions. It sounds like Autism, but needs to be diagnosed by a professional. Have you taken her to her pediatrician? They have an Autism screening form that you can fill out, then if it appears to be that, they can make a referral to a specialist. In the meantime, try to find an Autism support group in your area, the parents might be able to give you a lot of insights into how she might be feeling, or how to deal with her. If she's not Autistic, great! But you still would have the support of other people to help you to deal with her issues. These parents are the ones who have been through it all and can maybe give you some ideas.
As far as potty training, maybe put that on the back burner till you figure out what is going on, that's not something you can control.
Best wishes with your little one,