If a married woman is uncovering her hair at her home in a permitted situation mentioned above, does she have to keep the curtains/blinds closed so people looking in from the street can’t see her hair?
It would greatly depend on the exact scenario.
A window does not make someone invisible, so obviously, she is not permitted to exhibit herself to the outside world. By the same token if one needs to crane his neck to look into her windows that’s considered inside her home. (And that person may even be cited). So you have to use your better judgment.