No, I don't think so. The merging thing anyways.
Kid came from Schala, the dragons were already long ago in plot with that but I have an idea that literally as I type I thought of so if it's stupid, my bad.
The dragons wanted revenge, for the whole Reptites VS Humans battle and all, but countering them and all their plans was the Frozen Flame, Chronopolis and all of that. But(not remembering right this second, need to keep idea in head) Lynx was needed, so as to cause Schala to create Kid and save Serge. So perhaps the dragons just saw how Lynx was foiled once before(Lynx siding with Chronopolis and technically the humans even though he screws them over time and time again)by Kid when trying to kill Serge in Home World, and the dragons just happened to think it befitting that Lynx team up for so long with an ally who then backstabs him once they have access to the Frozen Flame and assist in his own downfall and slowly the human race and if they follow through with that, why not make it be the same person as before? Of course, obviously even if Kid were offered(which she wouldn't be)she'd refuse! Why offer to take down your whole race and get nothing in return except being the last one killed? Plus, if Kid already stopped Lynx once before he certainly wouldn't trust her, so why would he ally himself with her again? So they merely decided to create a being SIMILAR to her, a "dark reflection" of Kid, and so Harle was made.
Just looked back through it, please ignore that but I still stand this out down below.
Just an idea I thought of on the spot as I was typing. But I highly doubt that Harle has any relation to Schala, just Kid. Plus the way you typed it, you're saying as Kid is a technical offspring of Schala, Harle is a technical offspring of Kid, and I'm pretty sure Kid couldn't possibly give any form of birth to someone older than herself(since Harle was the way we recognize her back when kid was a, well, kid at the orphanage). The only excuse then would be what I just realized is also technically though the excuse for MY OWN explanation...
Time travel?