A.M.
In my experience, this is pretty normal behavior for a breastfed child. Sometimes they pull back from solid food before they even have symptoms of illness, sometimes it's just during the recovery period. And yes, you are right, teething could be involved as well!
You can rest assured that she is getting better nutrition from your breastmilk than she would from pedialyte, juices and teas. And that she will start eating solid food again soon! She is too big to stay away from food for long. So don't worry, just continue to nurse her on demand and offer food, she will start eating again as she feels better and her gut heals. Her poop will switch back to breastfed poop after a few days of mostly breastmilk, it will switch right back when she starts eating, again, very normal.
Good foods to offer might be bananas, brown rice, applesauce, whole grain toast (the BRAT diet) plain whole milk yogurt- you can sweeten or flavor it at home if desired with a small spoonful of all-fruit sweetened jam, orange juice concentrate, maple syrup, raisins, etc.- kefir, fruit juice gelatin squares, homemade chicken broth or chicken soup- add lots of garlic and parsley, fresh squeezed orange juice, kiwi fruit. Foods that will add bulk to her stool, foods high in vitamin C, and foods that will replace and replenish beneficial bacteria in the gut. Foods that contain gelatin, which is a hydrocolloid, will absorb excess bacteria in the gut and keep her stools from getting too hard or too soft, help her retain liquid in her system and prevent dehydration. Homemade chicken broth will have natural gelatin and no MSG. Garlic and have onions have natural antibiotic and antifungal properties, parsley is mineral rich and a natural diuretic.
Hope that helps! Take what you like and leave the rest.