Rose is a weird case, you would think being 2-0 against both Joanna and Weili would put her above them, but she overall has a bunch of relatively bad loss.Shevchenko has 8 defenses, 2 reigns. She's the obvious goat of her division and it's not close.
The next in her division is Grasso who defended once by draw, and Nico Montano who never defended it.
Joanna still has 5 defenses to Zhangs 4, there's work to be done. Rose as a distant third has 2 reigns, 2 defenses, and a win over Weili.