This sounds like a correspondent relationship? Did the child used to be there and it isn't there anymore? It could help the social media ladies in investigating the problem if you give them the child ID.
Hi Grace! Regrettably, your sweet kiddo is actually no longer on your account at this time because we haven't received a donation for his support since February 2018. When we go longer than 6 months without a donation, we must remove the child and place him/ her back up for sponsorship again with someone who is able to make the donations. Before we do this, we do try to contact the sponsor to see if we can work with them to get the donations back on track. I am so sorry!