She made a moral case against reproduction (climate change, limited resources, overpopulation!), so it seems illogical and irrational for her to defend mothers in Congress. Unless it's because only women in Congress should have kids.
“Only 10 women in the history of the United States have ever given birth while serving in Congress. 10,” Ocasio-Cortez wrote in a story posted to her Instagram, referring to the U.S. House of Representatives as a “hostile place to have a baby,” as vote schedules “pretty much” assume that no one has a family, as they change often and require frequent travel.