She has. Have a look at Grassroots tennis. Chucking bean bags around running relays with teenagers playing grassroots tennis. She's visited plenty of schools and sports and youth clubs and entered into the spirit playing hockey, netball, archery, table tennis.
The higher profile events, the tennis with Roger Federer and Emma Radicanu, the events with Judy Murray, raise the profile of charities set up to help grassroots sport.
You don't like her, for a lot of totally spurious 'reasons' reason, so nothing she does is ever going to be good enough.