same case as me. I just gave her one month notice & afraid before made this decision. (I don't want to spend so many on maid since I fired 3 maids within 1.5 year).
After she received my termination letter, she just feel calm & more respect us than before, even she finished the job before out on Sunday (she never do anything on Sunday & said it's her rest day for 24 hours). She will leave tomorrow & hope the next one will be better (you know, 1.5 year for 4 maids, how many time & $$ spent by me....