I have a tall, thin Lowe pack (a Kantega 2, long out of production) and I find it remarkably comfortable and stable.
If a pack is tall then you can get high-placed stuff over your centre of mass more easily with a gentle tilt forward, which makes for a more comfortable carry. Not so good on tricky scrambles but then you can keep bulky but light items higher.
A pack will sit on the hips if it has a decent hip belt. With women's hips being that more accentuated it may well be that a pack will appear to sit higher.
Basically, if you're looking to get one, get the person in the shop to load it with actual stuff you'd take to see how it packs and fills out
Good advice for any pack. But in general I wouldn't worry about a pack being tall until you try it and find you don't like it. They have pedigree and lots of us like them!
Pete.