Jamie Lynn wrote on Instagram that Maddie was so excited to see her friends and hand out "cute treats" to everyone in her class.
Spears called it a "great moment", given what her daughter has been through.
Jamie Lynn previously thanked fans for keeping the Spears family in their prayers. Thank you so much for all of your love and support this week. Above all else we are so thankful for each and every prayer, because we know that is what truly made the difference. She is wearing a light pink dress, her hands raised above her head, nearly as if she is trying to show off the gorgeous sky of warm colors behind her.
It's still hasn't been disclosed if Maddie was driving the ATV or if she was a passenger.
Upon arriving at the scene, Emergency Services resuscitated the youngster and she was airlifted to a nearby hospital where her condition was deemed "stable but critical".
Family members rushed into the water to rescue the child, who was "trapped and secured by the seat belt and the ATV's safety netting", the statement read. Doctors were able to remove the ventilator today and she is awake and talking.
Everyone is glad that Maddie came out OK after the accident, since it must have been terrifying.