I would not expect a long waiting time. Most planes from Europe have already landed. She should ask for the 2 (customs/immigration) forms on the flight and fill them out.

I am at MIA frequently, but could not point out a place where you could meet her other than in the MIA HOTEL at concourse E.

I found this:

Restaurants

The "Top of the Port" Restaurant is located on the 7th Floor of the Airport Hotel, offering fine dining with spectacular views of the Airfield and the Miami Skyline. The Poolside Snack Bar, on the 8th Floor of the Hotel also features panoramic vistas with both indoor and outdoor seating. Other Restaurants include Burger King on Concourse "E", "D" Level 2. La Carreta, for Latin food, at the entrance to Concourse "D", Casa Bacardi at the food court Concourse “E” and Chili’s Too Restaurant in Concourse G level two. There are two Ice Cream shops throughout the terminal one at Concourse "E" and one at "H" as well as small ice cream stands inside several concourses. There are numerous cafeterias and snack bars located throughout the Terminal, Cocktail Lounges are located at every Concourse and in the Hotel Lobby on Level 2 and on the 8th Floor. You will also find gourmet coffee stands throughout the terminal and concourses.
http://www.miami-airport.com/html/home.html
http://www.miami-airport.com/html/te...amenities.html