If a girl who was the picture of perfect health yesterday calls in ten minutes before her shift because she's "throwing up everywhere," it's probably a lie. If it happens to be Cinco de Mayo and it happens to fall on the most beautiful day of 2011 and the above happens, it's definitely a lie.
You're so gullible, manager! I would make that girl come in and work. It is her job after all.
By the way, I'm pretty sure I'm already coming down with something nasty for all of Memorial Day weekend. Apparently fibbing is going around.