Jamie Lynn Spears stepped in to defend older sister Britney after an Instagram user made a comment about her mental health.Jamie Lynn, 29, initially re-shared a series of posts on Instagram about mental illness from celebrities including singer Halsey and former Glee star Kevin McHale.She wrote: “If you deal with mental illness, then you know how important it is to respect the situation with privacy for the person, and the family trying to protect their loved ones, no matter how it may appear to