Camila beat Sharapova at 2014 IW and Azarenka yesterday; Maria and Vika are absolutely two of the 3 top-top WTA players.
Clearly, Camila is capable of beating any players if she plays to 90% of her abilities.
I don't think everything has to do with her abilities. There is head factor too. She seems to get her head in place for top-10 players, but gets confused or whatever with people out of top-30 That's why Woz is better. She is an ex #1 after all
Roberta Vinci Sara Errani Camila Giorgi Tatiana Pieri