Sickle Cell SS trait or FSS will not disqualify your application under excessive demand on public health. If your child is under hydroxyurea or Apheresis procedure still does not go above the threeshold. I know sickle cell is common in some part of Africa and Asia, but it needs close care beyond sickle cell itself [other body functioning] and mortality rate is higher in Africa than in Western Countries, that is what concern every parent. I saw comment from canucks that there are decent private clinic in Nigeria, unless if she is from Nigeria and she understands medical infrastructure and mortality rate then go with her advise. I am not from Nigeria either but i am 100% there are no such care to compare, and if there's it is expensive and far located. For sickle cell child, when in pain crisis every minute count and matters. If your hematologist can write you a letter as support your HC Application that a child will be under good care here in Canada, please request and attach it. Sorry for what your going through, hope your child stay hydrated and safe. Good luck