It's really sweet of your MiL to offer so much help and it's also her right to do so, but if your feel unimportant because of this development, the best way to deal with this problem is to speak to your husband about it.
Tell him honestly how you feel and why it's important for you and your MiL to reach an understanding to carry on this relationship without a dent. If he dismisses it at first, be persistent. He has to hear you out.
This way he will speak to his mum about boundaries and you don't have to be the bad guy!
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