i think the term you're looking for is "jungler" not "juggler"
second, cait is not ideal as a jungler. she does not have sustain abilities. she attacks slowly and has no steroid, so clearing the jungle will be bad. third, she does not have a gap closer or ability to chase down opponents. finally and most importantly, caitlyn is designed to be a carry. as a result she is squishy as anything. if the opponents see caitlyn coming, they might decide to focus on her instead and burst down caitlyn, causing the gank to fail.