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I don't have an official answer for you, just a guess.
Could it be that the woman's father made out his will some years before she married? He
might have simply forgotten to change the will to her married name.
Possibly this was deliberate, and designed to impress upon the son-in-law, that the
property rightfully belonged to the woman?
One explanation may be that this family was German or of German origin. My New York German ancestors often used the wife's maiden name in documents, well after marriage. Specifically, I refer to baptisms, where a couple would be the sponsors. For example the sponsors (or godparents) would be John Smith and his wife Anna Brown. After folks were in the US for a couple of generations they tended to adopt the local custom of the wife taking her husband's surname.
I also have a family, also German, where a father left a legacy to his married daughter and when she died, her husband had to apply for guardianship of his own children in order to protect this legacy. So, it passed from father, to daughter, to grandchildren, without being merged with her husband's assets.