If you are less than 60 days out, call DME directly. Give them your resort reservation number and make sure all names are correct and arriving flight numbers.
Then when she arrives at MCO she will go through immigration, then claim her checked luggage (if she has any), then go through customs. Then she has the option of placing her checked luggage on a separate carousel (or carrying it with her), and then proceeding to the main terminal and then down to DME.
When she gets to the main terminal, she has the option of claiming her own bags at the main baggage carousel OR just proceeding directly to DME.
When she arrives at DME, she just needs to provide her name and resort and they will print her bus pass. If she left her bags in the baggage carousel, then she can give them her claim checks and provide a description of the bags. If she has them with her then they will be loaded on the bus when she boards.