Try property records.  Marriage records are also an easy way to at least pinpoint an area they were living in which makes then slogging through property records a lot easier.  It's usually divided by county so you might be going to a lot of county websites.  Not all of them are digitalized so you might need to also contact them directly.  Also don't limit yourself to just your aunts name.  If you know her children's names or other relatives then they may have left more of a paper trail.  I found my cousin because another cousin went to court and I found him in the county court record.  I wasn't sure if they were related but I decided to follow through with searching that area which lead me to her.