In my experience was on a date and if I’m uncomfortable with a guy or I don’t particularly think things would work out I would mention it early on. Something quick and simple like “ hey so I know this was intended to be a romantic date but I don’t really see it going much further from here, if you sill want to continue tonight as friends I would be more then happy to or we could call it a night here?” 

In her case she could have been feeling awkward and trying to to draw attention to it she “played along” but most of the time girls mention if it’s not going to work out before going back to the guys place.