Well thats going to depend on why she wants one, The Condylactis is prolly the easiest to keep, but being native to Caribean they are not natural host to clownfish
The bubble tip (E. quad) are prolly the hardiest of the host anemones and are often available as cloned daughters( tank acclimated and divided by fission) IMO those would be your best bests, keep in mind no guarentees about clowns and anemones hosting. There are a few that are either aggresive or really difficlt so do a lot of research before jumping in
Keep in mind that wild caught anemones taken from the sea impact generations of fish and other organisms that host in them in the wild
I have a free Bulb Tip anemone that came with a piece of LR. When I noticed him, he was about 1.5" across. That was six weeks ago. Now he's about 5" across and growing! I have him under power compact lights and he's doing okay - color is good. I feed him tiny pieces of silversides once a week and the clown feeds him too.