Lahaina Divers' new boat is absolutely awesome. Big, fast, and roomy. She'll be happy with them as they cater mainly to more inexperienced divers. I found the crew to be really friendly. There will probably be some people there doing intro to scuba, however they have their own instructor and are seperate from the certified divers. I would NOT suggest taking them to Molokini though. The boat ride gets ROUGH! If you want to do Molokini, go from Kihei with Severns, Robinson, or one of those operators. Avoid the Maui Dive Shop. You said you have two charters lined up, Lanai and Turtle Reef. Lanai will be great (hopefully you'll get to go to the Cathedrals), but I'd skip the Turtle Reef charter and go to Molokini instead. It's a much better dive site. I'd suggest diving the back wall, but that might not be a good idea for a new diver unless she would feel comfortable diving along a 300ft. wall backing up to deep blue.
If you're staying in Kapalua, don't discount the Kapalua Dive Company (
www.kapaluadive.com). I REALLY like them. They have shore dive packages that run about $250 for 3 dives (night, kayak, and DPV). That price may seem somewhat steep, but there are never crowds and it will probably just be you all and the instructor. He'll basically cater the dive to your experience levels. The DPV and kayak dives are the best, just make sure to do the kayak dive from the Ritz so you can go to Honolua Bay. The DPV dive takes you into the bay right in front of the hotel pool, which has some awesome rock formations and lots of turtles. If you dive with them, request to dive with Paul. He's a great diver, instructor, and is really friendly. I got my OW certification from him.
One caveat about Kapalua: the shore diving in Kapalua Bay itself isn't that great. It's full of kayakers, swimmers, and snorkelers, plus the viz is only in the 20-30 ft. range. That's why I suggest the DPV dive and kayak dive from them...they get you out of Kapalua Bay and into the better dive spots.
Enjoy your trip.