Because she no longer had meaning to him. He even said that she’s not suppose to be in 1911.
Being in the wrong place at the wrong time is a bummer in that world. At least he did the dirty work himself rather than send the Cleft Lip Brigade to do it.
@Guy N'wah
The Unknown works for Eva.
He had to send Silja to the future, because Silja was destined to be Bartosz' wife. Hannah would definitely have problem with that, so she had to die.
What do you think?