#4. Joanna Jedrzejczyk - Former UFC strawweight champion

At one point Joanna Jedrzejczyk was likely the consensus pick as the UFC's female GOAT. At the moment, however, she faces some tough challenges to get back to that status. With that being said, there is definitely a path that could lead her back to that position.
Jedrzejczyk has stated that she is likely to face Weili Zhang in a rematch next time out. A win in that one would likely see her challenge for the strawweight title and quite possibly a third fight with Rose Namajunas. Should she beat Namajunas, the Polish star would most likely cement herself as the greatest strawweight ever.
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From there, if she were to move up to flyweight, once again, and this time beat Valentina Shevchenko, she would suddenly become tough to deny as the female GOAT. A win in a potential fourth fight with Namajunas would certainly cement her as the greatest female fighter ever.
#3. Rose Namajunas - UFC strawweight champion

Rose Namajunas possibly has the least complicated path to becoming the UFC female GOAT on the list. She is the current strawweight champion and has already avenged two of her four career losses. She will have a chance to make it three next time out when she faces old foe Carla Esparza in a rematch.
A win in that one would help her case massively. Namajunas would be in a position to go on a potentially lengthy title reign given she is only 29 years old. If she were to overtake Jedrzejczyk for strawweight title defenses, that might just be enough to become the female GOAT. However, she might need some help from elsewhere to secure GOAT status.
Given that a move up in weight class is unlikely for 'Thug Rose', she would likely need further slip-ups from the likes of Amanda Nunes and Valentina Shevchenko in order to overtake them. All Namajunas can do to help her case is continue to pick up wins, and she's been doing a great job of that as of late.