Why is my rabbit pooing seethrough jelly?

Is she getting enough hay? Hay should make up 70% of a rabbits diet and should be available at all times in an unlimited amount. Also, when you say you feed her "rabbit mix", does that mean there are seeds or colored pieces in her food? If so this could be the cause for her loose stool. She could be picking out the sweeter piece or seeds and is therefore not getting the correct nutrition. She should be eatin a pellet-only food. Make sure she's drinking plenty of water since rabbits dehydrate easily from diahrrea and die. If it continues you need to take her to the vet.