She is summoned, does miraculous healing, has a high level, refuses to reveal her status... there's no way anyone would figure out you're the saintess.
Now listen here. If I tried "you look different, you are so beautiful today" with my wife.
She would firstly ask "so you do not think i'm beautiful ordinarily?" and the second question would be "Who else are you fucking?"
i'm a woman and assure you that line ain't sound good for anyone outside shoujo. i mean, in wedding day would be fine but just normal day? ugh are you call me ugly before!?