Cries For Everything

My daughter is now 14 months old and cries for everything. If we walk her in the opposite direction of where she wants to go, she cries. If we give her supper, she cries. And she does the same thing when we are sitting at the table. When we put her to bed and take something away from her that she can't play with, the same thing happens.

I have checked to see if it is perhaps her teeth, a pain somewhere, her stomach, but everthing seems to be fine.

A friend said that it is just because she is spoiled. If so, then how would I get her out of this habit. My husband and I are highly stressed and we are not sure on what else to try?
She has everything she needs and there is nothing wrong with her health. What can we do?