Her husband has ran away and left her alone with her daughter. She was bedridden due to an illness. Her death is of horrific nature as she's eaten up by rats and mice.

After losing her parents, young flower selling Midori is put up by a fairground group. She is abused and forced to slavery, until the arrival of an enigmatic magician of short stature, who gives her hope for a better future. <br><br>
(Source: Anime News Network)

The basic plot is that an orphan girl named Midori is taken in (read: enslaved) by a traveling freak show. The freak show includes such unsavory characters as a mummyman, a snake woman, and a drooling man with no limbs. The owner of the freak show, the eponymous Mr. Arashi, is a strict man who allows his freaks very little freedom or joy in life. He is especially cruel to Midori, our heroine. Midori works, not as a freak since she is normal, but as a sort of caretaker of the freaks. <br><br>(Source: everything2)

Midori no haha