Is it true that Rashi's daughters wore Tefillin? If so, what is the source? Why could those women wear them and other women not?
The Aish Rabbi Replies:
There are some who claim that Rashi's daughters put on Tefillin, but to my knowledge it is not written in any authoritative book. Neither Rashi himself nor Rabeinu Ta'am (a prominent Tosefot author and son of Rashi's daughter) mention anything about Rashi's daughters wearing Tefillin.
You may have heard that the Talmud (Eruvin 96a) says that Michal, the daughter of King Shaul and wife of King David, put on Tefillin. However, the Talmud Yerushalmi (Brachot 2:3) says that the Sages objected to this.
(see also: Igrot Moshe - OC 4:49)