She wasn't really an adult in 1960/61
OK. But if she was married, she was still her husband's "property", no longer under her parent's thumbs.
Just because she couldn't vote doesn't mean she wasn't an adult for other purposes. 18 was the age for marriage without parental permission in many state for a long time. OTOH, some states had it as 16 for women. Younger with parental permission, even today. Contracts.. well that varied by state as well.
But in any event, once she's married I don't believe the parents have any control anymore...if she was married that is. If she was there should be a record of that somewhere. Most newspapers of the age, and in smaller areas even today, list all the marriage license applications as well as the births and deaths.