If she's such an amoral hardened criminal, why did she take them to the cops?
Answer that one question - why did she take the guns to the cops?
Merlin already answered it, and I followed it up - she felt entitled to steal, that it wasn't really stealing and the law didn't apply to her, because she's a poor defenseless woman who needed to be kept safe from the big bad mean guy, and everyone would understand it was ok for her to steal because the judge said he couldn't have these guns, so she just took the law into her own hands. She was entitled to, and had no inkling she'd be held to consequence for her actions, her actions weren't "wrong" after all.
I have no defense for a man who would hurt a woman, especially with a tool like a car. If he's guilty of 1/10 of what is claimed against him, he's a piece of filth who deserves the full weight of the law to crush him like the bug he is. And none of that, not one single part of that, makes it ok to steal from him, or to break into his house. It makes her little better than him. That she thought it was perfectly reasonable, and she went to the cops with her loot, does not absolve her of being guilty - it proves she's of an entitled mindset that thinks laws don't apply to her.
Answer the one question back, though: is it reasonable to assume she does not know breaking into a home and taking things is against the law? The obvious follow up is, if she does not fit the "entitled" mindset, do you think she did it knowing she'd be arrested?