Might be weird to to go right to the next line, “It cannot be. The Emperor is dead.”
What about…
“We’ve decoded the intel from the First Order spy, and it confirms the worst: Emperor Palpatine has returned.”
It may not shoehorn in any new exposition, but it gets Leia active. However, it may only further betray the fact Carrie was already gone to not show her delivering any portion of the line.