You are probably right, and I had noticed all those discrepancies, too, but thought it all rather odd that some things matched and others did not. Since census data is only as correct as the enumerator,I had wondered if there was a possibilty that this family in Texas could be theirs. I will try to search further to see if there are any other marriages of Mary's third husband.
I cannot seem to find where Mary or her second husband, John Bolling are buried.
Meanwhile, I appreciated all the information you have shared with me, and will continue to try to find correct answers with more valid proof.