I think it's mean people have been snickering behind her back. How very high school.
Don't say anything - she is a grown woman in her 30's. I'd be hurt and embarrassed to find out people I worked with were laughing at me behind my back - I'd rather not know about something so petty!
I cringe a little when people use bad grammar, but it's not my place to try and educate an adult on their use of words.