Women are generally controlling since they've done everything for their kids their whole life so giving up control for her is going to be very difficult. You have to be very sweet and not show impatience or that they are being unfair with you.
Get your husband and his mother together and simply suggest that you want to take on responsibilities and household chores because mother is getting old. Divide the tasks infront of your husband and make sure your mother in law agrees to it. Don't say that mother in law doesn't let you work when talking about this.
And in future if she again tries to take over your tasks you could talk to your husband about it and tell him that maybe she will listen to him more. Do not complain about it!
You really need your husband to help you to change your mother in law's habits.
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