EDIT: on reading the full thread, I can see actually it sounds like she does need support for her developmental delays, and this is obviously what needs to be the focus, not framing it as "talents" and comparing her to other girls her age in that regard.
This is all she needs. This is all wonderful stuff.
In terms of worrying about her future, virtually nobody gets a job on the basis of their talent for ballet, painting, football, etc. And even academics don't count for all that much in the end. I got excellent grades at school and have a (decent) job at the same level as others at my company who just about scraped through their exams. That's not because there's anything wrong with me or my job, it's just because there is so much else that people can bring to a workplace, so many different kinds of brains that shine in different situations.
I also went to school with people who seemed set on becoming a doctor, a vet, an architect, a lawyer, etc. Few of them ended up even studying for those careers, let alone doing them. Most of us work in jobs that we had never heard of or considered back then.
Resilience will get her a long way, especially if coupled with persistence. And kindness will smooth her path and bring her friendship. Don't forget too, that as well as her own earning potential, her quality of life will be greatly affected by her personal relationships, emotional wisdom and social skills.