The ‘Zeifman-fired-Hillary’ story is a false naritive of what occurred. But you are correct in that Zeifman had issues with her and even considered reporting her to the Bar.
Before you go believe what the supposed fair Snopes.com site says, or that Tampa factcheck.something says, try reading the alternatives.
Here’s one.
http://www.eohistory.info/2013/hillaryHistory.htm