In this case we would
Eat together at a table
Have some “safe food” - so for example pasta - have grated Parmesan, pesto, Italian ham, salad in separate bowls
perhaps talk about Italy and their food the home of pasta - find Italy on the map, look at their flag and use the gentle nudge theory, or at least at first having her sit round a table with others happily eating food without it “triggering” anything to at least display that there is a counter option to how she might eat at home
I don’t mean force feeding or starving if you don’t eat or use any psycho babble words at the dinner table. It’s possible to accept food choices without using the word triggering. It’s also possible to encourage children to eat a wider variety of food with gentle nudging. I know there are some who will never eat anything but safe foods but they are not the majority. And I think it’s healthier to assume no initial health problems in a 6 yr old child and that they are a product of their environment.
Of course this mum might be mentally unwell because of undiagnosed neurodiversity of some sort, meaning her daughter then has a hugely increased chance of also being neurodivergent. I get this.
What I wouldn’t initially do is ban my 6 year from playing with her, staying over maybe, but pkayibg or having her over to our house no. I wouldn’t want my 6 year old to think if another person doesn’t tick all these suitable qualities boxes they are not worth the time of day I think that is a terrible example as well. They are six, not sixteen.
We have a teenager coming round tonight who doesn’t get much variety of home made food so he’s having a selection of home made curry dishes, another one who knows he has to do a bit of revision at the table first. And then they will all watch the football together. 4 completely different social economic class teenagers, one who is autistic, all lovely boys, enjoying each other’s company leisurely. Not some fucking tick boxing “which uni are you applying for” exercise. Ours can get back to A’level GCSE work tomorrow.
It’s not difficult to be nice.