Autism is not a mental health condition, but many autistic people develop separate mental health problems. Often this can stem from a lack of appropriate support, which means that autistic people can develop more significant needs. Greta has OCD and has suffered an eating disorder (source: her parents).
Her parents say her involvement in Climate Crisis helped with her issues. It has given her a different thing to focus on but she is still ill and in my opinion is being used as a weapon by Greenpeace and other organisations who are fully aware of her mental issues.
Every time I see and hear her all I see is a very troubled Teenager who is being exploited.