I don't think I completely understand.
First, she said something which might be interpreted as 'forever alone' after you mentioning the height of somebody. That doesn't make any sense to me, there is no connection between these two statements. Why would that be her response?
Second, why would she not be able to stand you because of the child being 13 years old? Being jealous of somebody's height is something that I would say is fairly common. This one I could potentially see to be said in response to your comment and if that really was said, I'd say that's wrong of a T to say.
The third statement of her was either 'I don't know' or 'I know', which are complete opposites and I'd not base any opinion on my T on something that I didn't understand enough to know whether it was one thing or the other.

And then the third one again doesn't make sense to me, 'I need to marry to be happy... not even dead'? Those two things again do not have a real connection between them, I kind of doubt she said this.

To me, it sounds like you had a phone in your pockets and recorded a person who's a bit further away and sometimes maybe doesn't talk so clearly and are now interpreting things which you can't exactly understand as her attacking you. Since the insults don't really make a lot of sense in the context, I tend to think that you are not hearing the thing that was actually said. And once you've heard it that way, it's hard to hear it another (this is a known auditory/neural phenomenon).

I think if you actually want to record your sessions so you can listen to it later, ask your T whether that's okay and put a real recorder out somewhere in the open. Interpreting things that recorded your T mumbling through your pants doesn't help you or your therapy.

(I know you didn't ask about this, but I'd be actually much more worried about your T giving you a present for your birthday, that's much more of a boundary violation in my opinion, unless it was thoroughly discussed.)