Due to their familiarity with wards in Solvunn, and Wanda's frequent interactions with High Magic, they'll notice not only the rune but that it's different than what might be found in Solvunn's High Magic. Solvunn typically relies on a variety of blessings put together particularly for more powerful spells, whereas this rune appears alone.

Further, Wanda would not recognize the rune to be associated with any Gods of protection or shielding, as one might expect from a warding spell.