Mom doesn't respect my boundaries, or privacy?

So my mom has always crossed my boundaries no matter how much I explain to her why I feel how I feel & that it's wrong.. Like today she had company over who want to see my son, people I don't even speak to. So she just walks straight into my room where me & my son are (he's a toddler) doesn't even acknowledge me then proceeds to take him out to the living room where they are. I told her not to & he will come when he wants to.. she ignored that too. It's just many situations like this where I have no say on anything... I don't know what to do or why she thinks it's okay to act like that. My sister respects my boundaries & always asks me 1st. Out of respect I would do the same if I was in that situation... it's just exhausting & I feel powerless now
Mom doesn't respect my boundaries, or privacy?
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