As long as she is not berating you, or putting you down for not taking her advice, I would agree with a lot of the posters. Thank her for the advice, and then do what you and your husband feel is the responsible decision for your family. If it gets to the point where it is invasive and disrupting your own shalom bayis, then you may need to filter out what she’s saying with different listening ears. It sounds though that she means well.
Another idea that was posed, is to sometimes beat her to it, and ask her for her advice on things that you’re neutral on. You can still take it or leave it, but she’ll feel included, and will feel less of a need to constantly be giving the unsolicited version.