For how long? Has it been going on just since you got a new bag of this food? If not, I'd take her in for a fecal test right away.
Also, at her age - it'd probably best to move her off of a puppy food. Personally, I'd also get her off of Royal Canin - it has fillers and corn in it - so that could also be irritating her system and causing her issues. There are many better kibbles like Natures Variety, Wellness, Taste of the Wild, Canidae....
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |