Woman
noun
A woman person is a woman. The の particle here means the first noun is modifying the second one, so you can probably see why 女の人 (a woman person) really just means woman! It's more polite than saying 女 by itself, so that's all you have to remember.
おんなのひと
This word is actually two separate words combined with a particle. So, since you treat them like separate words, you read each of them with the kun'yomi readings (they are both single kanji words all alone). That being said, in level 1 you learned about the vocab readings for these separate words, so use that knowledge to remember the reading for this word as well.
あの女の人？マミさんだよ。
That woman over there? That's Mami.
このレストランには女の人のスタッフがたくさんいます。
There are many female staff at this restaurant.
女の人と上手にメールができるようになりたいなあ。
I would love to be able to email with women well.