The TARDIS here is most often using a projection, since she's still technically a space ship on the station. While solid, the projection is still only that and should be noticeable especially around the edges that it's not a real person.

She doesn't really have anything to hide, so that should be easy enough.

Her hologram always looks the same. She isn't good at hiding any emotional changes, but physically she can make sure it always looks the same at any given moment.

I'm happy to provide any other details you might want!