Answered by Ustadh Tabraze Azam
I am a woman. If my hair are long and not braided, must all the hair be washed, or the roots and the scalp also suffice?
The exception pertains to braided hair because of the dispensation granted by the Messenger of Allah (Allah bless him and give him peace) to women.
Otherwise, the obligation to wash the entire body remains, and having long hair would not be a sufficient excuse to wash only the roots on the head.
However, you could simply braid your hair quickly right before showering as being somebody who regular braids their hair is not a condition for the aforementioned ruling to apply.
Please see the following answers for further detail: Is It Obligatory for Women to Wash All Their Hair After Intercourse? and: Can a Woman Braid Her Hair Just Before Performing a Ghusl to Avoid to Wash All of It?
And Allah Most High alone knows best.
Checked & Approved by Shaykh Faraz Rabbani
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