So it's like this: (Spoilers for random scrollers!!!!!)
1st life, Born and died in Japan
2nd life, gets reborn into Vaveil, growing up there as a citizen. Then gets assigned by the queen to infiltrate the Dragon kingdom
-(The story didn't clarify if she remembered her past life or not, but let's assume she doesn't)
-Her Vaveil memories are erased, and the past-life memories come back, leading her to falsely assume that instead of being reborn, she was isekai'd
Finally, for some reason, she's dropped into the sky, meets the dragon king, and starts her "2nd life" in the kingdom.
Hope this helps ( ̄▽ ̄)╭

I dont get it.. so how did she end up falling from the sky? She was in japan, reincarnated in vaveil and then she died in japan? Im confused