It goes wholly without saying, at this point, that anyone at the hospital who knows about Merrin's aborted friend-date - or even the fact there's an Alien Trade Con today - is saying absolutely nothing about this fact to anyone who doesn't already know.
All of her fellow employees are vigorously maintaining to anybody outside the hospital itself, should the question arise, that Merrin has always cosplayed as a Sparashki while on duty, in fact nobody's ever seen her out of costume; sure it's a little odd, but lots of people are a little odd.