No. Henna colour is just colour which does not form a layer preventing water from reach to your skin hence you don't need to remove such colour for performing Ghusl. You must perform Ghusl immediately after your menstruation is over to perform your obligatory Prayers.
The divorce would not be valid if that was the case, and the best thing to do is for you both to refer to a qualified scholar for marriage counselling, and if no solution can be made and there is no hope for reconciliation, then husband can inform the qualified scholar and conduct the divorce in the correct way, meeting all the valid requirements, and give a document for it as well.
You need to be sure that the menstruation cycle has ended and there is no blood at all, then perform Ghusl of Haydh. If you doubt that the menstruation might not finished yet, you need to wait and check till you become sure that menstruation has really ended.
Minimum period of menstruation is three days continuously and maximum period of menstruation is ten continuous days. Bleeding after ten days is not menstruation but Estihadha during which SALAH is obligatory with rules of Wudhu or Ghusl.
Wassalam.
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