Here are your options, don't reply at all.

Option two Reply with this:
You are right. He should not see that.

If she replies after that SAY NOTHING. But it be used as an opportunity to AGREE with her, take her wind away.

M-34/H-35/S-4
Bomb-11-08
OW confirmed 12-08-OW ends 6-09
D finalized 4-10
Stronger=Happy