Angry colleague

[Bunnybunny1]

I teach in a school and have a teaching assistant who gets very angry throughout the course of the day. Every day.
I am starting to feel myself shrinking, walking on eggshells and generally feeling almost scared of her outbursts.
She is mainly lovely, just overwhelmed by insomnia and often apologises to me after an angry week but it’s just making me feel so uncomfortable.
She is very impatient with the children, quite questioning and critical of my decisions, complains, sighs, speaks very sharply to the children for the smallest things. I feel that the smallest tasks overwhelm her.
She interrupts my lessons to address my class, distracting them. It’s so tense. I can’t bear it when she’s like this.
what should I do?

You need to focus on what her behaviour is doing to the children. Talk again to your manager and tell them that the children are suffering and it's not acceptable and you hope they are ready to talk to the parents when they start coming in, furious at how the ta is treating them.

Line manager seems to me someone who may not want the difficult conversation. So follow up and request/demand a response quickly. Say by tomorrow afternoon.