Inverness is close to good diving.
Rainbow River was mentioned. It is a crystal clear drift dive. You will need a boat to do the North (prettier) end of the river. Put in at KP Hole, the county park with a beach. It is shallow but beatiful. You will get about an hour of BT. Your wife could drift with you on a tube/raft or just snorkel. There are some charters that do this trip if you don't have a boat or you can rent a boat.
Crystal River is also nearby and will probably be you stop for LDS in the area. Plenty of information on the web. Take another course from on of the shops and you can get training and dives. Your wife could either go to a pool or the city beach. She may even enjoy being on the boat with you.
Devils Den and Blue Grott are in Williston. Your wife could swim or layout at Devils Den but there wouldn't be anything for her.
Weeki Watchee is also nearby and a unique dive in the attraction. Information is on the web.
Paradise Spring in Ocala will not offer much for your wife but it is a good dive. Maybe she could run to town and shop while you dive.
Silver River is another good drift dive, but no beach and you need a boat. Plenty to see even for the non-diver from the boat. Rental kayaks are availible just accross the SR40 bridge. Charters are availible you just have to search the web to find them. Captain Peggy Goldberg,
Nature, Wildlife, Underwater Photography Tips, photo equipment for sale and Guided EcoTours by Captain Peggy Goldberg or Captain Tom are two that I can think of now.
Tarpon Springs is just south of you. There are dive charters that go out into the Gulf. This is an interesting town and there is a beach so your wife will have plenty to do.
There are many other dive spots in the area that I did not list. LDS and the web should provide plenty of information. Have fun.