What did it take to get a ticket in 1946?

I recently found my mother's name in the FAA registry as a PP-SEL.

I knew she had taken lessons and she had a Piper Cub solo certificate, but
I was unclear if she had gone all the way to the certificate. It's pretty
cool to find out your mother was a pilot.

I'm trying to envision what the program was like in 1946... I'm guessing
it was much simpler not having to deal with mountains of FARs, airspace,
electronic navigation or even radio.

Does anyone know what the requirements were in those days?

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Dallas