Is my home made dog food healthy, can I make it better?

I've been making my maltipoo dogfood. Is there any health food additive that would be beneficial. She is 9 months old. Recipe: brown rice cooked with water & chicken broth, ground turkey, and frozen mixed vegetables. I cook this all together and she LOVES it. I think it is quite healthy. Any advice or suggestions on this? Should I add something to make this even more healthy for her, or is it lacking anything?