Read other letters about this article
not all choices women make are feminist choices. As a drastic example: suicide can be seen as a choice, but it's not a feminist choice, even when committed by women.
The way I read Hirshman (at least her paper) is that IF you want to take a choice that advances the feminist cause, THEN don't take the traditional stay-at-home choice. (Given that you have a choice, that is.)
Conversely, if you have a choice, and you chose the traditional role of staying at home, you are free to do so, but to claim it is a feminist choice would be unjustified.