The most important thing is, she has no concrete evidence, everything is mere speculation, but this does not prevent her from wanting to use it to threaten Chen Yuan.
If both sides have leverage over each other, then mutual restraint can be established, and Chen Yuan can no longer threaten them over Consort Shu's death.
And now, what she has to do is to lure Chen Yuan into admitting this matter.
"Previously, you wanted to take the palace's prohibition order, and soon after, there was turmoil in the harem, according to the Imperial Guard's account, on the day of the ancestor worship ceremony,
there was indeed a stranger holding a harem prohibition order who entered inside. Who is this person.... is it still necessary to say?"
"This is just the consort's speculation, who would believe it if spoken out?"
"Is it? Then why did you hastily leave the Capital after the uproar during the ancestor worship? If this matter... is connected to the above matter,