Afaik she can't be filmed so she will always gain 1717 in a stat for training. I suspect that, unless you're either playing 24/7 every 4 hours to constantly train her, or paying to speed up training (5 gems for every 1717 in a stat) then you're probably NOT going to get 15/15 in the event. In otherwords, "Screw F2P players." - the devs, probably.