WORRIED ABOUT FRIEND

I have a new friend that is only 4 weeks post, I am 15mon post. She is telling me that she is able to eat cookies and icecream...things that I know are not a great way to start off your weight loss cycle...how do I let her know that what she is eating might not be the best for her at this time in her progress, and will slow her down on her weight loss goal????Thanks for the help...Shelly