I was wondering this because if not, there's no way she can beat Zabuza who is the best in silent killing ever, the best user of the hidden mist jutsu.
I think all mist shinobi know the hidden mist jutsu .and how to counter it . But thats just a guess . Her two kkg and water style makes for Trouble for zabuza in my opinion.
zabuza would lose easily but imagine this xd mei using her corrosive mist in silent killing so she'll surround her opponents in the deadly mist and so when they are weakened she'll use silent killing to take them out
Ill say Mei>Zabuza when you say how she sees him in the mist besides using a jutsu blind that gives away her exact position since sound is all Zabuza needs