What is the ruling on a woman lengthening her hair, and how should she observe hijab and niqab to avoid the description "their heads are like the slanted humps of camels"?

It is permissible for a woman to lengthen her hair. Scholars have only discussed the ruling on cutting her hair. The description mentioned in the hadith has been previously discussed, and some scholars have included the coiling of hair into a bun on top of the head within its meaning. Therefore, it is more cautious to avoid making a bun on top of the head.