We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Probably 50 years old, petite but not skinny, cute face, tight body. Perhaps a bit of facial youtherizing. Out of the corner of my eye while I was going through my jump-rope routines I watched her place a high box under the bar, jump up onto the bar and proceed to perform 12 chin-ups. I thought she would never finish. After a rest and some water, two more times. She is doing fitness-maintenance.
No visible muscles, just toned. Watching her proved several things to me that I knew anyway: Regular non-athlete women can develop good upper-body strength, people can be very strong and fit without notable muscle, and I suck at pull-ups as I do at many life challenges.
Watching three skinny wiry guys, my roofers these 2 weeks, carrying two packages of 80 lb. shingles (each) on their shoulders up high ladders. That is not just strength, it is balance and agility too. In other words, athleticism. Worthy of admiration and envy.
If nothing else, God and nature and life teaches humility every day. Like it's their job. Maybe it is. Sometimes I wonder whether humility is a psycho-vitamin which, like Vit D from sunshine, we obtain from investing in life challenges. On the other hand, no rewards, however modest, from our efforts are dispiriting instead of healthily humbling. That is a drag for sure.
When I was in high school, weight lifting was actually discouraged. The football coaches would try to get roofing jobs for their key players. (I didn't get one) They knew that "work strong" was the best kind of strong. Farm boys epitomized that in the days before mechanization; and even after.
Strength is the ability to apply force against an outside resistance. A lineman who can squat 405 will always hit you harder and be harder to move out of the way than a guy who trained with lighter weights like 80-lb packages of shingles. Not that carrying those packages up ladders isn't hard, it's just not as effective (or as safe) as barbell training.
Upper body strength: Doing 12 chinups 3 sets is good for a woman. It is reasonable upper body strength even though by your description she only weighs 100 lbs or so. In the greater scheme of things it isn't really "upper body strength" it is merely conditioning. Again I'm not denigrating it but it is what it is.
Many years ago the standard OP for a Humvee with a 50 cal machine gun was if the vehicle was disable by a mine or ordinance that the gunner would grab the machine gun, weighing about 85 lbs and run for cover. The driver or other team member would grab the tripod weighing about 45 lbs and a can of ammo weighing about 35 lbs and run to cover following the gunner. Any other crew would grab three of the 35 lb ammo cans and run after them. This isn't easy. Just picking the gun up is awkward never mind running with it. But it is the best choice for survival of the squad so it's practiced. For whatever reason; strength, pride, will power, whatever every male grunt can do this. I have seen 18 YO kids/boys who weighed 130 lbs themselves do this multiple times. None of the female crew could do it.
The first time my wife asked me how much she should pack in a carry-on bag for our honeymoon trip, I told her "as much as you would be comfortable carrying while running across the tarmac with someone shooting at you." A stroll through the Munich airport, with politzei stationed every 100 meters, armed with automatic weapons, convinced her I wasn't exaggerating.