The eight-year-old daughter of the former 'Zoey 101' star - whom she shares with her former partner Casey Aldridge - was airlifted to hospital last week after an off-road vehicle she was riding flipped over, leaving Maddie unconscious and underwater for several minutes.
Now, Lynn Spears - the mother of the 25-year-old actress - has taken to Instagram to send her "heartfelt thanks" to those who have sent well wishes to Maddie, and to say the young girl is "doing great".
Posting a picture of herself and Maddie, Lynn wrote: "I really don't know how to express my heartfelt thanks to all of you who have prayed continuous prayers for Maddie at this very difficult time! Thank you , God bless you and I know that the huge outflow of Prayers created this miracle and has humbled my family and I! Maddie is doing great and getting better everyday!! (sic)"
The news comes just days after Maddie was discharged from hospital in order to continue treatment in the comfort of her own home.
Jamie Lynn - who married Jamie Watson in 2014 - wrote on Instagram at the time: "Thanks to the amazing first responders, and medical teams at University and Children's Hospital in New Orleans, LA, we are headed home with our baby girl as she continues to recover. Above all else we are so thankful for each and every prayer, because we know that is what truly made the difference. Thank you again to everyone. We are truly blessed (sic)"
Since the tragic news of the accident broke, pop star Britney Spears - who is the older sister of Jamie Lynn - has asked fans to send their "wishes and prayers" to her niece.
She wrote: "Need all the wishes and prayers for my niece."