So, just my opinion...
It was light. You needed to harden her. You are and she's responding.
The next issue, the droop. Water her.
You transplanted. You watered. The water went down. Gravity. The root ball it middle-ish. It is trying to send some roots to the bottom to take advantage of the drink, but its not there yet. So water her.
The roots will get a drink and continue their journey down to the bottom.
You are getting a lot of input, and who knows, they could be right. But... I think I'm right here, even though I'm not a name you want to hear from. I'd bet on it though.