She actually did make the same argument with the house troon, too, at least once.
Other than "I have PPD", a constant theme with Becky for the past year and a half has been that the world is so mean to mothers, because other people had the gall to expect her to change her lifestyle after she had a kid. When somebody says that kids shouldn't be in certain places, Becky interprets that as saying she shouldn't be there, either.
The irony of this is that Becky acting like she's one of those moms who brings their kids to inappropriate places because she feels entitled to be there and couldn't be assed to find a sitter, while in reality, she's been trying to pass Hannah off onto anyone else since day one.