Puppy won't eat dog food?

3 month old puppy won't eat the dry dog food I've bought for her. The first day I got her, she ate with gusto the dog food. For almost the next 2 days she refused to eat. Only when I accidentally dropped table scraps from dinner did she eat. Now she only eats dinner scraps. She refused to eat dog food. I tried giving her a different type of dog food but no luck. How do I make her eat only dog food? I tried mixing the bits of the dog food with the table scraps but when I do, he refuse to eat it altogether. Please help.