Jamie Lynn Spears says her daughter Maddie's ATV accident was her "worst nightmare".

Maddie via Jamie Lynn Spears' Instagram

Maddie via Jamie Lynn Spears' Instagram

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 month when an off-road vehicle she was riding flipped over, leaving Maddie unconscious and underwater for several minutes.

Maddie has since made a full recovery and joined her mother at the baptism of her cousin Kylie Blair on Sunday (05.03.17), where the 25-year-old actress took to Instagram to say she'll "never stop thanking" her fans for their support during the horrific ordeal.

Posting a picture of Maddie holding her young cousin, Jamie Lynn wrote: A month ago, at this time, I was living a mothers/anyones worst nightmare happening right infront of my eyes, helplessly....Fastforward- Today, we were able to celebrate the baptism of our sweet Kylie Blair. I'm not one to preach, but we were shown God's grace, and we still feel undeserving of His mercy. I'll never stop thanking each of you for your prayers, because we recognize the miracle it created. We are beyond blessed, and we will NEVER forget y'all, and God's unbelievable mercy #Godisgood (sic)"

Maddie spent almost one week in a hospital in New Orleans last month before she was discharged in order to continue treatment in the comfort of her own home.

Jamie Lynn said 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)"

Meanwhile, pop star Britney Spears - who is the older sister of Jamie Lynn - previously asked fans to send their "wishes and prayers" to her niece.

She wrote: "Need all the wishes and prayers for my niece."

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