She could have take them away out of her mind so she won't use them for blackmail, that's what I would do because that knowledge won't stay locked up forever.
And there is nothing Waller can do about it, nothing. Because she just lost any and all power over the world.
She can enjoy prison.
Does Dreamer even have the power to erase memories entirely? Maybe she didn't because she literally can't.
What do you think?