I have dysphasia and I can not speak under pressure like that or in emergency type situations. I also speak in several languages
OP, in the nicest possible way, as this exchange has clearly brought back some horrible memories this sounds like the crux of it. You find it difficult to speak under pressure, you were already stressed, and you possibly slip into other languages (or get stuck in one I sometimes do). The SW found it difficult to get the information she needed (possibly you had prepared in advance what you were going to say, and she interrupted it, because she wanted answers to her own specific questions?) and wasn't as nice to you as you felt you deserved.
I think we've all been there at some point, and while it can be upsetting it's not personal.
I felt like the SW spoke to me in exactly the same way as my abusers. She even speaks using words, tones, grammar and with the same nasty ness as my abusers have used. I have seen and lived a different sort of life but the children have lived with this constantly for their entire lives. I don't want any more people with that attitude around the children.
I think that being interrupted and having someone be impatient with you has brought up some bad memories, again -- but they're your issues to deal with, and get help for. You are not the person of concern for her, after all, just a source of evidence as to whether these children are at risk. She didn't speak to the children that way. There's no evidence she will speak to the children that way.
And even if you didn't like her, and felt shaken by the call, this is a SW on an evidence-gathering phone call, not an abuser. It's not her fault she reminded you of something bad in your own life.
Do you have someone you can go to to talk things through, OP? I mean, I think you should send your concerns about the children in writing to SS, but it's also clear you need some support yourself, with what the fall-out from this phone call has been for you. But they are two separate things.