These items are for a spell to go to the moon. The mistress insisted that she wanted to go there before dawn, so I gathered the materials required for it. I would have returned everything when the sun rose.
[Being asked as to why she stole certain items, she's rather straightforward in her answer.]

Ahhhhh, killing the small fry is so pointless! I wish the one pulling the strings would show up already.
[She just defeated an enemy who had nothing to do with her mission, not too terribly annoyed.]

Those were Milady's orders. I cannot talk about the details. Please leave the premises.
[Being asked about the items she stole a large amount of time later, she no longer cares and tries to deflect.]