Missie, how's everything going? I hope you're doing well.
I don't remember how it came up, but I was discussing this case with my boyfriend tonight and we were brainstorming possible scenarios regarding Deanna. One thing that he mentioned was that normally (and I didn't even think about this; he reads way too many detective novels!) when a person searches the obituaries for a new identity, the optimal way to do it is to find someone your age from your town who died in infancy--therefore you'd need to go back to your town's newspaper during the year of your birth and do it that way. That's another--and probably better--angle to research. I know that doesn't help you vis-a-vis having to pay to research, but frankly, I'd be very willing to kick in a few dollars to a Paypal fund to help you out with that. I'm sure that this could get very expensive!
You could probably narrow it down (and thereby lessen the cost) by just searching the months around Deanna's birthday. I also think that any newspaper worth its salt would let you look in their archives for free, considering the cause.
Another thing that my bf brought up, which I thought was an excellent idea: did Deanna have footprints taken when she was born? Could those be run against a database of some sort, like DNA is?
Just some more thoughts!