Could it be her memory suppression in order to keep her effective in accomplishing her mission? Wonder what was suppressed and hoping it's something big, like she's actually a selune cleric that's captured and brainwashed (like Luna). Have included a link below for those that are interested in Shar and Selune.
https://forgottenrealms.fandom.com/wiki/Church_of_Sel%C3%BBne
She remembers enough that she shows a lot of discomfort with the Selune statue in the Owlbear's cave, or entering the temple that the goblins are laired in. You'd think traveling with a bright shiny cleric would evoke similar attitude.
