The moment she looks at it, the feelings she has tended to will lose all it's meaning.
Don't you notice? That for everytime she looks at that, she becomes disheartened. With her slave, she treats him as if he was her life insurance, she sees his status as a quest rather than a goal to pursue him.
With the mage, remember when she laughed but suddenly glance at his stat? She becomes disillusioned, she is reminded of her predicament.q
And with her adopted family, her brother with pink hair specifically, she sees his stat, and just makes sure he is in the clear.
SHE SEES IT AS A GAME STILL.
If she looks at Callisto's stats, she will begin to treat him like a game character rather than a person. Because in real life, you can't really learn how a person feels of they don't tell you.
She wants to see Callisto as a person and not a character.
There's also the other factor that she doesn't want to see his stat because she is scared to find out how he feels about her.
Wait this is such a read omg, you’re so right
Pen if you don’t want him I’ll take him