I have to admit that all three of my children have gone through this phase. I also have a 13 month old girl who recently thought this seemed like a good idea for meal time entertainment. It is quite simple to remedy. When she throws stuff intentionally, you take it away. If you do it the first time she tosses the food, you don't even have to mess with her testing you. I also have a small girl, and I like her to eat enough at every meal, but, she only tried out her new-found fun for a couple of days. In all honesty, I don't think your daughter will suffer either.
One quick note, I would keep her in her chair until you are actually finished with the meal, especially if it is family time. My kids all sit until we are finished eating, yes, even if their food was taken away. It is a great reminder as to what she is supposed to be doing instead of getting down and finding a toy or another distraction.
Best of luck, I'm sure it will work out just fine!
Oh, with the food ideas, all of my kids LOVE any kind of bean (black, kidney, red, black-eye peas, whatever). They all started eating them before a year and still love them today. Try lunch meat or small bites of chicken or turkey too, they are usually soft enough to chew. Olives are loaded with fats, mostly good ones, those are usually a hit. Potatoes are great, I am sure you've tried those.
Sgsin, good luck and enjoy your little girl, they really are so precious!