Thanks. Leaning towards Robinhood for ease of use. And yes, having these money conversations with her.
NO
Forget trading. Just do exactly what you want, but forget the fly-by-nights, like Robinhood. Have her settle into some fund with a stronger firm like Schwab or TD, and let them sit. Add in over time. By the time she is ready to retire, she'll be richer than all of us.
You say she is 14. Assume you are 60. Look where the markets were 46 ago, compared to now. Imagine where the markets will be 46 years from now? Buy and hold, and fugghedabboud the rest.