Dogs are very much like people when it comes to illness or even something like food poisoning (for example)... She may have eaten something that was bad or doesn't agree with her, suffering from a food intollerance or has developed a serious stomach or bowel condition . She would 'feel' very much the same as you would feel with digestive irritation and diarrhea. There are home remedies like canned pumpkin .. It might be wise to reasearch better on causes and remedies .. If it lasts or more than a day, she might need to see a vet.
http://pets.webmd.com/dogs/guide/dog-diarrhea-causes-treatment
