Mexicans say Mon a lot.
My daughter whose 8 brought her Mexican school friend who is seven over to my house to paly with her dolls. I try to be nice and I pick my child up and ride her pigyback. I put her down and asked the litle latino girl if she would like a piggyback ride and she said yes. I pretended to faint near a small creek running through my property and she kept saying no mon no mon.
I put her down and went to my living room and the kids had lemonade and cookies that my wife had baked. She ate four of them so I guess that meant yes mon.
Dont let your daughter play with her, she sounds like bad news!