the show teases these two but nothing came of wither because, from what I understand, production was hell and under constant threat of cancellation, which as we know was consummated.
You know what I think though? This show could have been more than a curiosity if it was serialized. No, it doesn't have to be super duper Avatar levels of serious, but it felt odd to have some aqua teen level shit happen to Sheldon for example, then get an aqua teen ending where it's essentially retconned on the spot and the next episode never goes over it. I think a character in the vein of Jenny could actually lend itself to a cohesive, interesting kid's story.
That and I'm horny as fuck for Jenny and have been since I first watched the show as a kid, but that's another can of worms altogether.