It sounds like perhaps she’s quite sensitive to changes in her diet. We’ve had just a few reports like this and it hasn’t lasted more than a day, to our knowledge.
We suggest you start on a 1/4 scoop daily and gradually raise it to her recommended dose. If she gets a softer stool, don’t raise the dose until she’s come back to firm, while still getting doses daily.
Stopping and restarting is going to slow her adjustment.
Likely, her gut Microbiome is shifting, as we’ve got a Probiotic in Canine Immune Complete that she may not be used to.