She has to be booked with DME before arriving to be able to use the service. I would suggest calling DME directly when the flight info is available and explain the situation, I'm sure they'll accommodate her [perhaps even FedEx some tags].
If you are registered and haven't received tags, they can still retrieve and deliver the luggage to the resort. Just be able to describe the luggage [a polaroid or digital pic of the bag(s) works great] and provide the claim stubs at check-in and they'll take care of getting your bags from baggage claim.