This probably seems like a minor thing but it feels like the straw that breaks the camels, ie; my, back.
DD is 10 and for years she's struggled to let me chat to other adults when we're out. For instance if I see a friend in town she'll be whispering under her breath, anxiously, that I must not talk to them. She gets herself into a state and can get upset and aggressive, I'll get yanked away and she kicks my feet. She will also go silent if they talk to her. I don't force her to talk to people either, although a hello would be nice.
Her older brother is nothing like this and happily says hello to people I bump into and will hover while I have a quick chat.
I'm a LP which doesn't help and DD has had issues since pre-school age, not sleeping, , violence and stubbornness etc. I've had the usual story of being dismissed by CAMHS, and bit of help from school parent liaison person out of their depth.