Friends & influences

Hi! Miss 13 is significantly improved her behaviour in the family with incentives to have a sleepover…so tonight I dropped her off at a family that I trust and respect. but then at family worship my daughter’s friend openly declared that she hates her school, doesn’t care about life planning that she’s only 13 and it’s no big deal. She wants to drop out of school at 16 and do any vocational course and get a job. She also made silly comments at the meal – when her mother encouraged her to wait for everyone to be seated “delayed gratification predicts your success in life” was the mothers encouragement to wait and the daughter said “oh well I don’t want to be that successful” and quietly picked at her food in defiance…
How do I respond? I was torn between do I even leave my daughter (who is highly influenced by her friend) or do I trust that we will be able to talk it through?
I ended up leaving her as to not cause a scene but I am planning to have a parent counseling session with her. It seems as if my friends daughter is trying to embarrass her or get some attention- Do you have any tips for how to respond to other people’s children??
Half of me wants to make a statement and say “your behaviour is horrid to your mother & we think you need to sort yourself out” or live and let live… and we will talk it through?