Hi there.
I actually live in Tenerife and have a small childcare buisness.
The anthelia is the hotel that i recommend to all of my clients as it is great for families and is in a superb location, right on the beach with lots of things to do, soft play for the kiddies, mini golf, family bike hire, inflatables in the ocean and many shops and restaurants.
I persionally find that the restaurants can really vary in price and trying most of them along there, there is nothing that is really special.
My favourite places to eat are in Los Cristianos and Las Americas over the dancing fountain but they are quite expensive.
I think that the food at the Anthelia is really good and always somuch to choose from. Even if you do eat in the hotel each eve you can always go out and about after for a drink and a wonder around.
The buffet at anthelia is themed each evening but with always a kids corner, pizza and pasta stations and a meat/steak place. It is great and the puddings ... so yummy.
If you need anymore questions about the hotel or surrounding areas dont hesitate to let me know.
The long and short of it is, i think your friend and her child should go with the half board option that was offered. Sounds too good to pass up.
Have a great time.
Lisa