I can't recall how old Dudu is, is she a puppy? If so, puppies get diarrhea for all kinds of reasons, one of which can be overfeeding.
I understand wanting to feed home cooked and fresh ingredients but if Dudu is a puppy, I would avoid replacing meals with home cooked. You don't want to throw off the balance of the kibble while she is still growing. I would stick to the occasional fresh food "topper" instead.
I would also do some research into home cooked recipes. It's not as simple and just cooking some food and putting it in the dog's bowl, especially if you plan on going the home cooked route in the future instead of kibble. Dr. Pitcairn's book is a good resource and has some recipes you can follow.