Is it necessary for a woman who suffers from hair loss, dandruffm frizzy hair which becomes dry to pour water on hair while doing ghusle janabat. I know that it is necessary but is there any consideration for women like us? I can understand that while doing mensturation ghusl it is easy to do but ghusle janabat is more or less frequently done as compare to mensturation ghusl so is there any way out? Like can i just wash my whole body except hair? Because even if you pour water than also it cause tremendous damage to hairs

You do not need to wash all your hair, or even to pour a lot of water on it.
What is required is to let the water reach the whole scalp, and you can do so by just pouring small quantity of water and rub it to reach the entire scalp.