Help

My cousin had ADHD and a illness called OSDD (OSDD-1 is the subtype that is most similar to dissociative identity disorder (DID). It is used for individuals who have similar symptoms to those with DID but who do not meet the full diagnostic criteria for DID. Most commonly, this describes individuals who have dissociative parts that are not sufficiently differentiated to qualify as alters (sometimes known as OSDD-1a) or individuals who do not have amnesia between alters (sometimes known as OSDD-1b). Some individuals with OSDD-1 lack both amnesia)

WAIT STOP READING THE ESSAY (the OSDD is like mental illness that have alts/alter or something like that)
so, i am the only one who can help her. She always told me her problems to me. Idk what I can do to cure her from the illness. What should I do?