Well that was a stupid thing to do. I'm lactose intolerant and can't eat anything with dairy products even in it, the littlest amount of something containing dairy makes my insides feel like their being ripped in half.

Two wrongs made an extra-wrong. Giving a lactose intolerant child sneaky milk is horrible, giving ANYONE expired milk is horrible. The only way she could have screwed up more is if she just poured the milk on your daughter instead of in the glass.

You may not be able to fix stupid, but you can numb it with a 2x4

I can see full custody in your future. Well... If you want your daughter to have a future.

Why would you insist on "curing" lactose intolerance when you can have soy/almond/oat milk? Out of sheer conveniance? Maybe we're not meant to drink cow's milk because we're not calfs?

Maybe she should take care of her brain intolerance and look up diseases and conditions or talking to a doctor before trying to cure them.

I guess slowly introducing dairy work help the girl if she had a mild allergy, so I can kinda see how one might get an allergy and lactose intolerance mixed up, but I'd expect her MOTHER to have fully researched lactose intolerance and understood that it's not an allergy but an emzyne deficiency.

OP, I'm gluten intolerant and my mother did to me what your ex wife did to your daughter. Honestly, after shaming my mom and pointing out how irresponsible she were, which could've led to much worse consequences, she became very conscious. But the only way to actually protect your daughter is to fight for her custody and prevent her mother to be alone with her.

My daughter is the same... And I'm expecting my ex to try this as she also says things like 'she can have it sometimes, it's only a lot of it that effects her' ... Needless to say, a tiny bit makes her ill.

You can try sneaking expired shit into her food to cure here from her life.