She's been shown to be cool and manipulative (how she managed to meet Danny; crashing her car into the neighbor's gate so Danny could escape without detection), yet wildly irrational (threatening to take Danny back to court over visitation after the football field incident, yo-yo-ing between Danny and Stan....she immediately hooks up with Stan when her and Danny fall apart, and moves thousands of miles away with no thought about the impact on her daughter, now she boomerangs back to Danny when things get rocky with Stan. Not to mention the completely irrational urge to leave Hawaii immediately in the absence of coercion by Wo Fat---again with no thought to how this will affect her daughter. They've made her come off as completely cuckoo)

Umm... I see all of those things as being consistent with Rachel having a bit of an impulsive streak and needing someone to counter that, to steady her. Which is why she's attracted to Danny - he's impulsive too sometimes - but also why they're bad for each other.

YMMV but I don't see her as cuckoo *shrugs*