Stupid MILS

Nothing makes me more angry Then when people interfere with your parenting!!!!!! This is a rant but I'm sure some ladies can relate !
My MIL was over and my daughter randomly slapped me across the face and then bit my hand when I grabbed her hand. My MIL witnessed the whole thing so I picked up my daughter took her to her room and said "you do not bite and you do not smack it is very very naughty so now you can have time out in your room and when I come back you can apologise!" My daughter starts crying because she didn't want time out but TOO BAD! So as I put her in her time out corner my MIL walks in and picks up my daughter and walks out of the room! FURIOUS I chased after her and grabbed my daughter back and said to her DO NOT ever do that again and my MIL starts complaining that "oh she said sorry get over it she's just a kid and I'm here I didn't come here for her to sit in her room she said sorry so stop being ridiculous".... Like seriously? No wonder her kids are spoilt little shits that constantly disrespect her ! Ugh