So that was why she was quiet for few years...

Takeuchi-sensei had a baby to take care of in the last year.

http://www.animenewsnetwork.com/news/2009-12-24/sailor-moon-takeuchi-hunter-x-hunter-togashi-have-2nd-baby

The citation comes from the HunterxHunter manga.

Eh?!

So that explains a lot. She was pretty silent during the years Petit-Ouji was just born. So does this mean that the rabbit is representative of a Petit-Hime too?

I want to know...