Hey Jenny, we noticed the same thing with Neko after a few weeks and I suspected it was the soy milk we were suddenly giving in abundance (not to mention soy yoghurt etc). I cut right back on that and replaced the soy where I could with other alternatives and that seemed to help. Also, our paed told us that long-term constipation can lead to a very stretched and lazy bowel, meaning that the slightest trigger will now set her off for a while yet (eg stress/anxiety, medication/antibiotics, not enough water, not enough fibre etc). Can't remember if I already suggested the daily oats and green veg regime? We have to get her to eat oats in some form daily, and offer green veg as more than half her meal (currently trying broccoli, kale, spinach, peas...)
Fx it gets better soon for you guys xx