I think it is clear that she's writing about female founders in this batch and not YC partners.

She neglected to include the co-founders of Plangrid (Tracy Young) and Medmonk (Somaira Punjwani). They, too, have fascinating backgrounds. (Since presentations were only 2.5 minutes, it was easy to miss some if you had to leave the room.)

"The Women in the Y Combinator Batch" is a less readable, viral headline. I think it's sort of obvious from the first paragraph or two that I'm not talking about partners, just the most recent class.