The ability to do a pull-up is not entirely dependent on your level of fitness, so even very fit women may have trouble doing pull-ups.
Here's why you can't manage a pull-up
For improved shoulder health, work yourself up to a pullup. Here's how.
A Ladies' Guide to Your First Pull-Up
Chin Up vs. Pull Up - What's the Difference and Which Is Better
Ask a Swole Woman: Please Tell Me How to Do Pull-Ups
For improved shoulder health, work yourself up to a pullup. Here's how.
The 30-Day Pull-Up Progression Program - Master a Pull-Up in 30 Days
Chin Ups vs. Pull-Ups: The Difference, The Benefits & Muscles Worked
What are some exercises to help you build up your upper body strength for doing pull ups and chin ups? - Quora