I know it sounds silly, but Facebook is good people finder. Try it as your first outlet, post a picture of her & ask people for information if they can identifier her. If your looking for more in-depth way of finding someone you should consult a private investigator. Last but not least reach out to the police to see if there are any records of her that could give you her last known location. I hope this helps, never lose hope & Good luck.
Try checking on you computer. Places like ancestry.com. That is a site that charges though. I have ancestry. com but if you give me the information Ask.com will delete your question, because that's considered invading her privacy. Also we aren't supposed to give each other names, or others names. There is another thing to always think about, and ask your family as many questions as you can, because sometimes, probably not in your case, but it could pertain to your mom, sometimes a person comes up missing on purpose, because they have too, in order to protect their family from harm. Just be sure of that, and be prepared for what you might not like to hear.