
Quoting
cdwjava
You have allowed her to remain at your mother's, so that doesn't really make her a runaway. If you want her to come back home, you go to your mother's and tell your daughter it's time for her to come home, and you collect her and bring her home.
And, why is CPS involved? If there is already a case open, you may want to tread lightly. If you make a scene or use force to bring your daughter home, that may exacerbate whatever the issue is that got CPS involved in the first place. And if your mother's home was so bad, why'd you agree to this in the first place? How long has she been at your mother's?