How to address someone telling you what is wrong and right with your parenting?

I have a friend who recently became pregnant and all of sudden thinks it's okay to put in her 2 cents about how my husband and I parent our son. We give him fruit as a snack (banana and orange) and she tells us that fruit should only be a dessert because of how sweet it is. She baby sat him one evening at our home and told us we need more educational toys for him (uh we have tons, we just didn't take them all out when she came over) he is potty training and after months of having number 2 accidents and trying every reward tactic, we found offering him a dum dum sucker as a reward does the trick and he has not had an accident since. We got a lecture on that one saying we should give him a sticker. Yes, in a perfect world I agree with her on that one, but we also need to do what works for our kids. I could go on and on.... what is a polite way to address this before I go crazy?! I can be pretty pive and she is a pretty good friend, so any ideas on polite ways without offending her? I am sure this happens to other parents out there and would like to hear what you did! Thanks so much!