Well this is a highly subjective question so please understand – this is only my opinion. You could ask that to 1000 people and get 1000 answers and none of them would be right or wrong.
In a relationship, her voice is heard and equally respected and doesn’t get walked all over. Same with her friendships and other relationships. Her ability to stand her ground against someone she loves when things are amiss and she risks losing that person – yet she still does what she knows is right – and speaks up and says what might hurt the other person.
The ability to look inward and ask herself “was I wrong?” Or “how could I have done that better?” Being able to handle self criticism or even constructive criticism from others and listen to it is also a key indication that a person has a strong mind and is not afraid to listen. But having a big heart, especially during times of conflict, and not allowing emotions to tune out the other person are also signs of strength.
In practice, a strong woman would be a woman who has the wherewithal to do whatever she has to and needs to when the opposite desire is present, but still doing it, and being able to do it with a smile.
Getting up and going into work and busting her ass when she’d rather let somebody else do it all for her. Or a stay at home or working mom waking up and preparing meals for her kids and dropping them off at school on 4 hours sleep, and doing it with a smile and still making life joyful for them, then going to the gym or something else productive.
Like I said – just my opinion. I could go on for days. I could just list out the qualities of my mother and that would be a pretty damn good bio of a strong woman.