I'm afraid I don't know much about the rest of the Mobley family.All I can say for sure is that we aren't talking about the same Mary Mobley.Our Mary's were born about 20 years apart, yours abt. 1822 mine in 1846.
I don't know much of anything about the rest of the Mobley family.
Have you tried the message boards at gencircles.com or at freepages.rootsweb.com they don't have as many postings but they do get postings from people that haven't listed anything here.
You might also try the mailing list for Mobley at Rootsweb.