Male pattern baldness

Since it's case of female and it's male pattern baldness DHT lowering treatments like finasteride is not OK.

I hope she'll be pretty fine at least until her menopause if she uses minoxidil daily . (That's the only FDA approved medicine of male pattern baldness for females, I repeat don't use minoxidil+finasteride combination sprays on females, it will cause huge problems for her)

And take hair specific multivits like Abott's Follihair just to be on safer side.

And for shampoo I can recommend Abott's Minichek.

Don't use any oil or some random conditioners.

If she needs to use conditioner, she can use Glenmark's Hair4u conditioner.

1st of all no shampoo or conditioner is going to help in this case
But less use of chemical substance and more use of herbal products is recommended

I had similar kind of issues while i was working in Rajasthan, what i realised it was due to water

So

What i did i just trimmed my hair fully

And started using Derma Roller 0.5 & a mix of Castor Oil, Coconut Oil, Rosemary Oil ( 1 - 2 drop ) and it worked like cherm

See you have to understand what's causing the hairfall

Hairfall is not always a disease

Most of the time its a signal that Something is wrong in your body

That could be anything

Even Stress , Hormonal Abnormalities, constipation, not taking adequate water etc

So a proper diagnosis is required for any kind of treatment