As it happens the mirror plays an important role in the letters of Clare of Assisi. Very strange.
The following comes from the Third Letter (11-14):
O Lady most beloved in Christ, joy of the angels, and crown of your sisters. (12) Place your mind in the mirror of eternity; place your soul in the splendor of glory; (13) place your heart in the figure of the divine substance; and, through contemplation, transform your entire being into the image of the Divine One himself, (14) so that you, yourself, may also experience what his friends experience when they taste the hidden sweetness that God alone has kept from the beginning for those who love him.
This is a quote from the Fourth Letter about the mirror (15-18):
(15) Look into this mirror every day, O queen, spouse of Jesus Christ, and continually examine your face in it, (16) so that in this way you may adorn yourself completely, inwardly and outwardly, clothed and covered in multicolored apparel, (17) adorned in the same manner with flowers and garments made of all the virtues as is proper, dearest daughter and spouse of the most high King. (18) Moreover, in this mirror shine blessed poverty, holy humility, and charity beyond words, as you will be able, with God's grace, to contemplate throughout the entire mirror.
In both instances the emphasis is on the shifting awareness, new and other thoughts, when reflecting on oneself looking in the mirror, just as on card of the Two of Swords from the Tarot of the Crone.