On a way, Hikki is much more the Britney Spears of Japan than Ayu... She have been working non-stop and being on the media since she was a child!
People always say she is lazy when compared to other jpop divas, but we can't forget she released 8 different studio albums during a 12 years time spam, and she composed or co-composed (almost) every track from all of those albums and produced herself half of them... There are succesful musicians decades into their careers that don't write their own stuff and released much less music than her.
Let the girl take her break and live her life, she deserves it!
And just to be fun, the song that she herself said represents some conflicts she has with her popstar career: