@puchiko: I never felt like they were ever gonna be able to recover from the flawed premise of Hanebado anyway. How could a mother abandon her child simply because she lost a game while extremely sick and no one points out how fucked up and wrong that is!? And then she brings the excuse of wanting to make her a better player on her own, when all it did was make her quit the sport altogether.
The real problem with the show though is how they seemingly change Hanesaki's character at the drop of a hat. First, she doesn't want to join the club, then they make her remember how much fun she had playing Badminton, then she's excited to have teammates that support her and bam, psycho Hanesaki is back treating everyone like garbage. Also, Connie's backstory seemed awfully melodramatic, although I did like that they showed her actually being a decent person later on (although the bathing scenes were really dumb fanservice.)
I like that with Hanebado! the show didn't try to redeem the mother. There was a lot of concern early on that whatever reason was given the show was going to try to present the reason as, "See? She was a good mother all along!" What we saw was a terrible mother admitting she did a terrible thing by abandoning her daughter. The really important point is that she specifically states that she doesn't regret her decision.
I don't agree that Hanesaki's personality changed at the drop of a hat. She had very specific triggers that set her on this downward spiral. The appearance of the pink haired girl Kaoruko made her relive the loss that she attributed to her mother's abandonment. To make matters worse Connie then shows up and essentially declares that she's the one that took her mom. I'll link the scene as it's a clear demonstration of her breaking point. The mom finally showing up at the end only reinforces Hanesaki's delusion that she needs to beat everyone to have the right to finally abandon her mother. It's a common sentiment shared by kids in similar situations to want to reject their parents for leaving them alone. I've seen it myself in real life.