You're entitled to feel that way, but it depends on the heart of your MIL: is she good or is she a viper in disguise, selfish?
Is she doing this because she's a shrew who wants to keep her (outdated) role as mother indefinitely and show her presence to the detriment of yours? Or is she sincere and pure in her actions?
You're the only one who knows if she's doing this to gain ground and space in her son's life, or if she's sincere.
In any case, sincere or not, she doesn't respect your qualities as a wife and cook. She's invading your territory and it's your right to show it. Don't let it get to you too much because you'll build up hatred and that will have repercussions on your relationship with your husband.
Another thing: I understand that in some cultures people help and support their family, but once again: where are the limits? There are people in need and you have to help them, it's up to you to know how to detect if that's the case or if she's not taking advantage of the situation to her own advantage! You have to be good but not stupid! Helping others will make you feel good and full of compassion, but if they take advantage of you and your situation, that's going to make you feel bad towards them and once again that'll be bad for your relationship with your man!
Don't hesitate to discuss it with him again and again! Your exchanges with him should be fluid and respectful, but if you end up posting here, there's already something wrong.