D.S.
When she does it make eye contact and tell her NO!!. When she does it again take her out of the high chair and say no more!! She will probably cry, but you will show her if she throws food this is the consequence. Wait a little while and then put her back in the highchair and try again. If she throws the food just repeat the process, she will get the message within a few days that this is not acceptable. This is perfectly normal behavior for this age what really matters is how we address it and stop it. To them it is a game let me see how many times mommy can bend over and pick up the food. If you don't play the game she will stop trying. Trust me a child will never starve themselves. She will eat when she is hungry. Good luck!!