Miller already had it, unfortunately.
If any transmission has occurred, it would potentially be on the transport vechicles to/from the WH & the rallies. Hicks would have been on both Marine One (often) & Air Force One (every time). Her lessened proximity to the president in those vechicles, coupled with her admin status, put Trump in the group most likely to attain the virus. Trump’s also just taken a test which takes a couple of days to get the results to return, not a daily test the WH uses.We won’t know the results for a day or so, at least.