Look at the fee agreement or the other papers you signed. A document may have given the attorney authority to sign your name. The attorney...

My lawyer sent me an email telling me what her "opinion" was $$ wise to the value of my case. I disagreed.

It is quite common. If an attorney is questioned they dump the case. While the attorney must get court permission to withdraw but this is...

What are the consequences for a lawyer who retaliates for a bad review by throwing out a final invoice and creating a new one?

The action you describe is very suspicious. Of course the bills need to be analyzed and the facts more closely reviewed.