GRR! What should I do?

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As you guys know, there is a lady across the road with a baby 9 days older then my little one. Mine is 11 days off turning 1yr old. So sweet! Anyway, to the problem; The other mum comes over a lot, which is great, even though we have our differences. Our babies are so different. Mine will eat any food under the sun, she picks out all her veges first before she eats her meat. While the other baby is still on baby food for 4 month olds because "She doesn't like real food"... Now that frustrates me to start with.. Shes asks me for advice, with her 'boyfriend' and her parents and so on. I take in her problem, I think about it and really make an effort to think things through and I give her my final answer and she says its wrong! She says that my advice is wrong, and she is going to do it 'this' way. She goes out, and handles the situation 'this' way and it ends in disaster. She turns around and says oh, if only I had done it 'that' way. WHICH WAS THE WAY I FIRST SUGGESTED! I don't know what to do. She is always asking for advice, and I'm sick of giving it just to be shut down. How can I tell her to sort it out herself without being rude?