I've added the DNA tag to your question to help bring it to the attention of the DNA project. However given Gemima was born in 1827 I'm not sure how good the medical records (if any survive) would be for answering your question.
I am aware of the Lily project http://www.thelilyfoundation.org.uk/
which may answer part of the question for you, or at least help you with finding an answer. It also may be worth discussing this with your own doctor as well, to see if they can provide information for you.
All the best