There really is no other way to establish it Jen is a every day normal woman and thus her experiences are those of other woman and her having to deal with it in the same way many other woman also do. There is no tragic back story for her to relay for why she’s has better at it then Bruce just real every day experiences.
The only other way you could really establish her being more stable then Bruce would be to attack his mental health and trauma and put him down due to them which would be way out of character.