Hi Phil
My Boys are all on Bakers Complete, they absolutely love it but they do get varied things in it from Sardines, Tuna, Nature Diet, Butchers Tinned, Cooked Minced Beef, Raw Chicken Wings, Grated Cheese and Boiled Rice. They don't have things mixed in it every day or they would soon turn their noses up when I just gave them the plain Bakers but every other day or so they get something tasty in it.
With her being so young I would only introduce a few little things, maybe scrambled egg or grated cheese. If you are happy to give her different things every other day then try her out with little amounts and see how she does. Ensure that her main meal is her biscuits and just add what ever you fancy in with it.
JMT