Is it too much to expect a 5 almost 6 year old to understand that their actions have consequences and what those consequences are?

My daughter can't seem to understand that doing A results in B.

For example: I told her to stop waving her fork around at dinner. She didn't listen. I explained that if she continued, I would have to take it away because she was waving it near her head and could hurt herself. She swung it around and caught her ponytail and ripped out some hair which obviously hurt. She cried, but could not tell me what happened or how. I had to explain it to her and she continued to say the fork hurt her hair but could not understand that she hurt herself with the fork.

Another time, she was playing with her Barbies. She was being really rough and pulling on them. I told her to please not pull on her Barbies like that because their heads come off or their arms or legs do and she gets upset. She refused to listen. I explained that playing that way means her dolls will break and she won't have as many. She ignored me and then got upset when her two favourite Barbies got broken. Again she could not tell me how they broke. She seems to have zero understanding about how her actions contribute to the outcome.

She does this with everything. We don't punish her when she breaks things or hurts herself. We explain things like "When you pull on the Barbie's arm, it breaks. If you don't want it to break, you need to be gentle."

She is a normal kid otherwise but cannot for the life of her seem to understand that doing A results in B. I don't even know how to explain it to her any simpler.

Help because I feel like I'm going insane.