For me bestemma has an air of authoritativeness in it, and decide just doesn't seem strong enough. As it sounds to me this girl doesn't just want to make a decision, she wants to be the boss, to make up the rules, etc.
She wants to rule maybe? But that's too strong and sound like she's a dictator and not just a schoolground bully. Does anyone else have a better word in mind?
I agree that the translation isn't all too accurate, but I'm also lacking a proper English word that's definite enough, but not too dictatorial. :/
I agree some of the initial meaning of the sentence gets lost in translation here but at the same time, the translation is not unreasonable. In certain contexts, I would say it's a very precise translation.
She wants to rule doesn't feel like a good fit to me.
Maybe "She wants to always make the decisions"? "She wants to make all the decisions"? Per DehPuh below, "She always wants to be the boss/in charge?" English just doesn't have one neat little verb for this.
To call the shots maybe? Although informal, but sounds like a perfect fit to me