Is it okay that the new growth is of such bright green (almost yellow at the base) color? Is it because of the fast growth or am I doing something wrong?
Kinda the same way that a babies skin isn't the same as a 50yr old man's.
It is more obvious in the morning/before lights on. The growth that happened in the dark hasn't seen light yet and hasn't started to photosynthesize yet.
Nothing to worry about, it's a sign she's very happy.