Lulu Gribbin returned to Mountain Brook High School Friday, 15 weeks to the day that a shark attack left her critically injured.

“Today was the day I witnessed the most amazing moment in my life,’’ her mother, Ann Blair Gribbin, posted on her Caring Bridge website.

“I woke up and went to check on Lulu to make sure she was up. I walked into the bathroom and Ellie (Lulu’s twin sister) was doing Lulu’s hair,’’ Gribbin wrote. “Ellie had woken her up. Ellie was helping her get dressed for her big day.”

“Ellie was there. Ellie has always been there,’’ Gribbin said. “It was a moment of two sisters, twins, identical twins, bonded for life caring for one another selflessly regardless of the situation.”

Lulu and 16-year-old McCray Faust, both Mountain Brook High School students, were on a mother-daughter trip at Seacrest Beach on Florida’s Gulf Coast June 7 when the teens were bitten while looking for sand dollars with their friends.

Lulu was critically injured, losing her left hand and her right leg above the knee. McCray sustained bite injuries to her lower leg and foot.

She underwent multiple surgeries and was fitting for prosthetics before returning to Alabama from a North Carolina hospital in August.

Just last week, Lulu was shown golfing on the lulug.strong Instagram account, which the teen and her family have used to track her recovery.

Gribbin’s Friday update said the family’s “new normal” has been “crazy to say the least.”

“We are juggling four children all with different needs and activities on top of the new needs of Lulu. I have found myself most days with definite brain fog and feeling mostly overwhelmed with everything that is being thrown at us,’’ she said. “I also find myself being grateful that I get to be overwhelmed, and that Lulu is here and is thriving.”

Lulu is doing physical therapy and occupational therapy three times a week for two hours at a time.

She has been doing her schoolwork in the family’s den, with the help of a homebound teach who checks in on the teen a couple of times away.

‘’I am so thankful that Lulu’s only injuries were physical ones,’’ Gribbin wrote. “She did not have any sort of brain injury, and that smart girl is still here.”

“She has diligently done every class in our home with really no guidance from me. I have not ever one time had to tell her she needed do school, she just does it,’’ she wrote. “She took her first chemistry test last week. In typical Lulu fashion she got the same grade as Ellie and literally did it all on her own.”

“Today Lulu went back to school,” Gribbin wrote, “and I am so proud of not only Lulu but her amazing sister Ellie. I hope she knows how truly amazing she is.”