Was her child screaming? Doesn’t sound like it!
She wasn’t doing anything that justified his mods lurking in her chat or monitoring her yet she’s being targeted called a neglectful mother and now he’s threatening to stream her to an audience of around 500 people that’s not accountability that’s intimidation.
What makes this even worse is that she’s a stay at home Mom and creating content/lives could be a nice little stream of income for her. Using a much larger platform to publicly target a smaller creator can have real consequences for her livelihood and reputation. You can disagree with someone without sending your community after them. The power imbalance here makes this behavior, especially messed up.