It can take up to 6 months to receive letters -- especially if the child missed a letter writing day. I just yesterday got a letter from one of the kids I last heard from in October and still have two more I am watching for.
Hi Katie! Thank you for contacting us with your concern for your sweet kiddo! I am sorry you have not heard from her since October. There may be a letter in process, and if you do not hear from her by the end of April, we can request a letter and verify that she is okay!