Hi devaloco
Just a few idea that I think might suit
Looking for something on the beach,kids club and entertainment.
The Abou Sofiane (PEK) is located directly on the beach and has good children's facilities and club, the Riviera hotel just behind it is also a good choice, not directly on the beach but just a few minutes walk takes you directly there.
Was looking at The El Mouradi hotels.
Never stayed in one but they do get reasonable reviews and are not overly expensive and are in a good location.
Just unsure which place may be best.
We like PEK (Port El Kantaoui) as it is a lovely clean modern family friendly resort with a bit of charm, set directly on a lovely beach with nice clean sea.
There are 2 main parts to PEK the marina area which has nice restaurants and small shops and the area up by the fountain which has some nice restaurants and shops and a small fun fair.
The good thing about PEK is that there is not much hassle from shopkeepers, should you wish to go in to Sousse and visit the Medina it is easily done via the road train, taxi or on the little Tuk Tuk's
May have a boat trip,do some shopping, horse riding for my little one would be an added bonus etc etc.
Although never done it myself I do remember seeing horse riding on the beach advertised in the hotel and also camel rides on the beach and you will be able to take boat trips from the marina on glass bottomed ships or those Galleon type ships.
PEK also has a (small) zoo & botanical garden your daughter might enjoy that. If you like golf there is also a superb 36 hole course there.
Anything else just ask