The reason why it's hard is because the event only gives you a little more than a week to grind 215 hearts for a maxed summon. Assuming you get only 1 heart per Expert run on average, this is absolutely impossible to accomplish unless you luckfag and get 1 or 2 as drops. Even if you get one summon as a drop, it's still near impossible to finish break limiting the summon unless you are always spending AP optimally throughout the entire event.
I'd actually like to say that most people aren't even getting one heart per Expert run on average so RIP. It's unrealistic to think anyone could max her out at the moment as a F2P player but I'm assuming that most of the people who are mad at shit drops are mad because shit drops are the reason why we won't be able to max anything.