In simple terms:
Petra's Team is not run like your usual top 4-10, young grand slam champion, potential multi-grand slam winner, all court, explosive, talented players team.
I would compare it to, a young player, that's outgrown their coach/parents story, we've witnessed so many times.
However, in this case, it's Petra's Manager/Benefactor and his team (who he picks and provides for her), that's the over matched parent she can't/won't leave.
I hope you get the gist of it? I'm trying to be polite/respectful to some of our more impassioned, prideful Czech Comrades/Brethren.
If that's not enough, then I'll add a little more.