Why would there be never trumpers in the White House ?
Preibus brought her in.
He is friends with Ryan and Walker, Cheap Labor Express Republicans and could be a mole himself.
Not sure why, but the one place they might want to completely clean out would be the kitchen staff.
She came in with Priebus. Joined Priebus as his Chief of Staff when he was still RNC Chairman, in the spring, before the Republican Convention.
NeverTrumper is probably too strong. She did work on a contested convention. Side reports were that her family were NeverTrumpers.