Thanks for posting this. It’s actually been very helpful to reflect on how different people express gratitude. I think we all have different levels of self-centredness and will make different levels of effort in situations where we help people we’ve just met, acquaintances, close friends, family etc.
We will never know, but possibly this lady, or other people, may not have offered as much help to another child, as you did, if they were in a similar accident. In fact, she didn’t seem to want to take it as serious as you did as she had no intention of calling the ambulance, for example.
I find it really hard when people do not reciprocate the level of kindness I show them. I wonder if some people even see kindness as weakness? So even turning up late and setting the agenda for the time to show up on your weekend - she seemed to dominate the terms and conditions, perhaps because she could see you were a kind and conscientious person? (I am just speculating...could also be her head was full with a million things to do and it just hadn’t occurred to her to show any token or gesture of gratitude or to show up on time because she is so preoccupied).
If I were you, I would focus on the fact that you helped the little boy. I don’t think he will forget that and it means he will have some sense that people can be kind, considerate and put other first in the world (I do not know the mother, so I am not judging her, but I just mean it’s nice for children to see the compassion you showed). Hope that helps.