My puppy is 3 months old and this afternoon suddenly the food packages fell down,I don't know how much food my puppy had eaten,she act normally until tonight at 7pm.she just lay down,seems so hurt,doesn't want to drink or eat anything,and her breath seems weird to me.wha t happened to her?

I have no idea what happened to her. Maybe the food packages injured her.

She needs to see a Veterinarian. This is the same advice I would give you if your child won't get up, seems hurt, won't eat or drink.

Why does this seem weird if food packages fell on her?

Are you saying the packages fell on her? Or the packages fell and she dove in and ate a lot of food?
Either way if she seems hurt and she is now not eating or drinking, then she should see a vet.

Have you taken her to the vet, yet?

If not:

When you say 'food packages' are you talking about the individual plastic bags of food like many of the 'burger' style foods come in?

If there is a chance she ate a plastic bag, get her to the vet. She may have a blockage.

Regardless, she is in distress and showing it. She needs help as soon as you can get her help.