The real question is whether or not being raised by her biological parents would make Maomao more or less wacky. Personally, I think she'd be even weirder.
She'd probably not have ended up much differently oddly enough. She would likely still not be raised by her biological father, because it's the way he behaves that is the reason she outright dislikes and hates him for being a creep. Funny enough, I still suspect she'd end up raised more by her adoptive father than her biological father even if this less tragic timeline had occurred. Which would probably mean not that much change in her behavior.