Well, the first thing that comes to my mind is a picasso or clown trigger!!!
I think a purple tang will hold his own with one of those guys? If I'm wrong, someone please correct me 
IMO there isn't a cooler looking fish out there than a picasso and I understand they get very tame, which meets her pet
requirement
Good luck. Let us know what you decide. 
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Katrina
90 Gal AGA with 2-250W 10k AB DE MH, 220W VHO, Turboflotor 1000, GEO calcium reactor, Pacific Coast chiller, DIY phosphate reactor and nilsen kalk reactor, sps, clams, zoanthids, rose BTA, ocellaris clown, 2 green mandarins, royal gramma, purple tang, sargassum trigger, flame hawkfish, coral beauty, neon dottyback, purple and blue linckia star, brittlestars, snails, snails, snails
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