Parents agonize over whether to tell their child, and if so, when and how.
Unfortunately, with a learning disability there is still some stigma and there is a desire to protect your child and a wish that she will gradually understand why she is having difficulties. Waiting does not help. I have discussed this with dozens of teens and young adults with learning disabilities. Virtually all wish that their parents had told them earlier and more directly. Though there may be tears, your child will likely be greatly relieved when she learns that it is her learning disability which causes her problems.