A 16 year old can waste his or her life by this age if he or she does really badly in school or smokes weed and gets caught. I can forgive teens for a lot of silly things like lying, cheating, petty crime, etc. but not doubling down when caught and creating a social media hatemob for someone questioning her.
Also - she is not a kid. There are at least few countries in which a 16 year old can have sex, drive, drink alcohol, join military academy, etc. and at 17 or 18 the list of countries grows to hundreds of entries.
And she is a "prodigy", not any ordinary kid and she defended herself very well (and evidently successfully considering the thread calling her out on reddit got outright removed, not just downvoted) on social media and even called the person claiming she is lying a "jobless disturbed harasser and bully".
She has attended MIT Launch, was intern at Sales force. Along with writing that app she also localized this app to 10 languages (I'm not sure if she did it herself via Google Translate, the way she writes about it is not clear), optimized it for iPhone X, prepared a full release, all within these 2 months while coming across new techniques and concepts and learning them on the fly.
This is all in her medium.com post and if she can do all of that she can get held to the same standard as an adult. And if it's someone just using her persona and doing all this then there is even a bigger problem, bordering on personality theft and fraud.