L.:
Every parent has a different way of discipling their child/children...there is no correct style of discipline. So she says "pop" too often (and in your opinion it is not effective)... is there a better word for "pop"? I would rather hear the word "pop" than spanking or a slap on the butt.
Your child is a toddler and beginning to speak...so she is going to repeat words she hears. She will eventually stop...it is just a phase she is going through.
Now you also mentioned you were thinking about talking to your friend about her discipline style...you and your husband have chosen to discipline your child in a different manner (and like I said...there is no one correct way to discipline). Your friend might do one of two things...she might thank you for making her aware of the fact that she says "pop" too much OR she might be offended and your friendship could suffer from it. Are you ready for this?
I have a sister-in-law who has chosen the "time out" method of discipline (and again...let me stress there is no one true correct way to discipline....it is a preference to the parent/parents)and that woman has no control over her children! Her oldest child (now almost five) is out of control. When she tries to discipline him...he runs around saying he doesn't like her and spitting at her and everyone else. Let me tell you...a good "POP" would do him some good!
In my opinion...how you choose to discipline a child is a preference...there is not correct way. We are human...we make mistakes. We try to learn from our parents mistakes and try not to make the same ones with our children. I don't think your friend would ever hurt your child and really...I don't think she's aware of the fact that she uses the word "pop" too much.
Take care.