Leah Messer
"Teen Mom 2" star Leah Messer was accused of using drugs by her ex-husband, Corey Simms. MTV/Viacom

A sneak-peek clip from Season 7 of “Teen Mom 2” revealed Ali, the daughter of Leah Messer and Corey Simms, would not be able to walk in the near future, but this might not be the case — at least for now. Though she has muscular dystrophy, the 6-year-old has continued to walk since that clip was filmed.

“Ali has her wheelchair available, but she only uses it for long distances,” an insider told Radar Online in an exclusive report Friday. “She’s usually on her feet.”

In addition to muscular dystrophy, Ali has a problem with her small optic nerve, which forces her to wear glasses. “Her eye twitches at times, but she sees fine,” the source said. “Ali wears glasses as a form of protection, to help out with her optic nerve.”

News that Ali would have to utilize her wheelchair more came from her doctor. When Simms tells the doctor Ali falls up to five times a day, he delivers his prognosis. “Her strength is still quite decent,” the doctor says. “But once she’s getting to age 7, then gradually, the maturity affects her. Then she may very slowly get weaker.”

When news of Ali’s prognosis hit social media, Messer, 23, praised her daughter. But she put a positive spin on it. “We are so proud of Ali!!” she wrote Thursday.

To find out what happens with Ali, don’t miss the premiere of Season 7 of “Teen Mom 2” when it debuts Monday, March 21, at 10 p.m. EDT on MTV.

Follow me on Twitter @mariamzzarella