watery poop-but not really?

I have a 3,5 year old english angora female who is spayed. Twice this week i have heard wet fart sounds come from her, And when she moves away from the area there is a watery stain. Im washing her mats almost daily because of this so shes kept clean. She does have normal poop frequently this seems to be happening though a couple of times a day. Its not staining her butt either. Nothing about her diet has changed,no medications for illness. I did give her some benebac on tuesday thinking it could possibly help her. The only way i can describe this is literally wet farts. I was startled when i heard it the first time,all my rabbits are kept inside my home. The second time she did it my daughter heard it,so its obviously fairly loud. Has anyone had this before? I have 8 angoras,shes the only one doing this.

What is her diet(type and brand of pellets, hay, veggies, treats, supplements, etc)? Has there been any sort of stressful event lately(eg. car ride, new pet in the home, consistent loud noises, predators hanging around, etc), or environmental stress(excessive heat or cold)?