My daughter is having cough, cold and blocking chest, recommend me some home remedies for her. She is 2.8 years old

You can make what we call kashayam. Add pepper corns,holy basil,cumin,garlic,ajwain allow it boil well in the water with a pinch of turmeric powder then strain and make the kid drink around 50ml of it. Repeat for three days you may see improvement.