Mrs. Fulliautomatix, just like Mrs. Geriatrix, is never named in the albums. Where Impedimenta is very vocal and assertive and where we can expect a snarl here and there from Bacteria, Mrs. Fulliautomatix role is limited to just a few lines. Only in the later albums she gets a line here and there. 

I am sure she is more than just the wife of Fulliautomatix.