Her finding out she was adopted and a mix breed may had something to do with it. Knowing that now, she'd be too self-conscious around her pure breed friends to stay.
Or maybe she didn't have what she could really consider as friends back at home. Everybody she knew probably was snobbish in which developed the persona she displayed at the series' beginning. Itty Bitty Kitty could have been a big target of embarassment there as it started out as when Whiskers found it, amongst other things.
Perhaps there's a secret she left back at home, even. One that, at first, she was confident in concealing, but did some thought, and would much rather tough it out in the jungle. Far-fetched, but a possible twist.
Then there's the growing fondness to all her jungle friends. Being as close as she has been to them for so long, I would find it hard myself to leave.
And maybe the Amazon gives her new territory to conquer in the sense of fashion and social status (a challenge she easily overcame back in Florida).
Another idea is that she could had started losing her barings to some degree. Felt it was futile after all the previous attempts. That, or just dishearted after that one dog came then got rescued from the jungle that was from a richer family.
A lot of speculation, but possible reasons, nonetheless. Still, an explaination should've been given sometime in the second season. Could had made for a great full-length episode special or movie as somebody already mentioned.
A good time, I think, would've been during her monologue in "Rip Van Whiskers", at the very least. Could've gave reason behind the sudden shift of behavior in the last season and maybe spiked enough interest to kick off another season (hopeful thoughts).
Either way, the modernizing did come about pretty quickly. If it was played out that Brandy had a hand in it all coming about, then I could see that. But when Lola mentioned that the shopping mall was there all along but they didn't tell them, that kinda screwed with things. I agree with what was said about the writers at a lose for ideas.
I personally am tolerate of it, and would love for an extension to the series by having another go or a movie to top things off. They could do like they did with Kim Possible with renewing the series having a noticible growing development with a relationship between Whiskers and Brandy stemming off from that kiss.
(Eh. I'm feeling bad for the pass couple of hours. Might be a combo of caffeine crash and dreading going back to school tomorrow. Need to work out a schedule to draw and write. x.X;)
(Anyways, if I strayed from the topic, that's why. ^^
