Hello,Welcome to Just Answer and thanks for your question. Which Wales family would that be? We need names, dates and places of birth, marriage, and death to search records.
When was she born?
While waiting I did a search for Martha Melvina Wales. I found no online birth record for her anywhere in the world under either Martha or Melvina. Keep in mind that a lot of records have not been transcribed, particularly in the islands. You would need to check parish records in Bermuda to find her.