Dani has noticed something is not quite right with her and when flying over Kansas her ghost form becomes unstable and she drops down from the sky. To her luck she falls straight on the path of a woman who has been through this before.
Smallville and DP:
I think there's a lot of potential with this crossover! Let Clark be a cool older bother to Dani. Let him have a little sibling who he can show his powers to and play sports with. Let Dani find parental figures who love unconditionally. Let her find a home. I think Smallville is just strange enough place for her to feel like fitting in.
But also, here my thought was that the timeline diverges from DP canon right before D-Stabilized, so Dani is NOT fine. Her form is unstable. She doesn't know if Danny would have a cure for her in Amity Park. She doesn't know if there even exists something that can help her or if she is destined to end up as a puddle of goo like her siblings. Is there a cure to be found in the middle of Kansas countryside? Does someone with a lot of money and influence show up offering one?