L.W.
oh man..my kid is 2.5 and is just starting to get the 'hang' of using silverware properly. At that age, its hard. they pretty much only use their hands. I wouldnt be expecting a 12 month old to use a spoon or fork. ..the mess is because they are exploring "How many holes can I put this pea in???" dont worry too much...she knows how to eat so if she is hungry...she will eat.
If you want less mess, try sticking with goldfish, fruit loops, cheerios, nothing with dip, or goo.