She saw it, but since her boss didn't say anything, Jiang Xian wouldn't either.
Superiors are hard to please.
The Emperor had summoned her to keep him company and grind his ink while he drafted a decree promoting her father. He must have intended for her to see it. However, the Emperor was a suspicious man. If she were to thank him rashly, he might be pleased in the moment, but upon reflection, he might suspect her of peeking at the imperial decree—an act of defiance.
If a boss suspects you, the worst you'll get is some petty grief.
If the Emperor suspects you, you're just waiting for a round of Nine-Kin Annihilation.
Clearing up his suspicions was impossible. He would only use every method at his disposal to confirm what he already suspected.
For an Emperor with limitless power, suspicion was a conviction.
