Can I sue a public school district?

My grandaughter of whom I have custody of was signed out of school by her mother, whom has no custody or even visitation with her, I had in the school my custody papers and that her mother was not to even pick her up. Her mother was not even on the emergency cards. The school did not even check, and they have seen me several times there and have never seen her mother. I have the signout papers from the school releasing my grandaughter to her mom with her moms signature on them. Now this happen almost two years ago, I'm not sure if there is a statue of limitations on this sort of stuff. Do you think I have a case against the school district? My granddaughter is willing to testify to this also, she was there when this was all taking place. I also confronted the school at the time, I was pissed off, her mom is a drug abuser. Can you please let me know if I can do anything?