“Cherrybim, before you start to wonder why they would ask about hair covering before, for example lashon hara, tzedaka etc- it’s quite obvious why it’s often used to guage level of observance……Hair covering is there for all to see easily.”
It’s quite obvious how well she observed that mitzva. It is no indication whatsoever of how observant she was of other mitzvos. Some of the absolute biggest baalos chessed I know do not cover their hair yet they are extremely dedicated to their avodas Hashem in every way.