I would add Islamic Museum, barbecue on the beach (sea is still quite cold, but for a short bath...), why not Zubara fort, sand roses near Dukhan, fishing trip from Sheraton, or even bowling and cinema...
There is a classical concert on Sunday, depends on what time she's flying...
Enjoy your week end.
Schedule an afternoon dune bashing experience (with professionals!)...MAKE her ride a camel & take pics
She would love high tea at the Ritz (2:30-5:30ish)
Isfahan Gardens in the souqs for a great dining experience (eat downstairs majlis style...on persian carpets)
Walk around Villagio...take a Gondola ride (short, but sweet)
Take a drive out to the Pearl and have coffee on the boardwalk
Go to Turkey Central to show her how the real people live
Visit a local juice stall