I roll the normal + ramdom rainbow deal.
At least she is dodge unit, I'll use her in swan-ship stage when she ready to go.

game ; I not complete event yet, but Nae max EXP is set to be 306,022.
I believe we only need to feed Nae until she get her 14th growth stage to get special reward.
So if your Nae is at 14th growth stage your work should be done.