[Merry]

She could have been born anywhere, but obviously more likely than not to have been born close-ish to where she lived later.

You need to make a list of the possible baptisms and then see how many you can eliminate.

I presume you have said the wrong year in your last post (1876??). It's unusual for a couple to name two childen the same if the first one hadn't died, but it does happen rarely. I have 10,000 on my tree and only one case of that happening that I'm aware of.

EDIT - I just realised you meant one was Ellen and one Mary Ellen. Again, unusual, but possible. (Assuming they were not almost a century apart!)