Leah Messer has faced many challenges during her years in the spotlight.
But none has caused her as much anguish as the ongoing health difficulties endured by her 10-year-old daughter Ali.
Ali suffers from muscular dystrophy, and while she's been receiving the best available care throughout her life, in many ways, her condition has worsened.
Now, Leah is opening up about her daughter's struggles like never before.
And many Teen Mom 2 fans have found themselves deeply moved by her remarks.
Take a look:
Leah often states that her three daughters are her entire world. And the pain she experiences watching 10-year-old Ali endure an endless battery of medical tests is apparent throughout many of her scenes on Teen Mom 2.
Messer does her best to offer all of her girls the same experiences, but the sad fact is, there are certain activities Ali will never get to enjoy.
Supporting From the Sidelines
For example, while Ali clearly derives pleasure from watching her twin sister compete as a cheerleader, the pain of not being able to participate herself must be acute.
Sadly, Ali's condition is degenerative, and many of the updates Leah has received in recent years have not been favorable.
In a preview clip for the upcoming episode of Teen Mom 2, Leah opens up to a friend about Ali's struggles.
Her Greatest Challenge
"[Ali]'s so smart, and it's like she's trapped..." Leah begins, as video shows Ali getting helped into a car by her grandfather.