I need a good breakup spe

Why turn to magic at all?

Get proof, call the cops, support her and take her to counseling if you "care deeply" for her.

Besides, have you even casted spell before? It doesn't say anywhere on your profile that you know anything of magic. So if you are new to spell casting, I would not suggest doing so because it could make things worse.

they have a point... im sure its hard... but inside your heart you know the answer

I've been in a similar situation.
So speaking from her defense, depending on the severity, you don't need magick...
She just needs to stress the problem to the abuser...

Aside from the police, getting involved is up to you, but making yourself noticed just on your own can help. Let her know you could protect her..
You can't just say you'll protect her, though.
Act on it.
Just prove yourself to her.

As someone who has been in her shoes, things with abusive relationships are really complicated. Before intervening in any degree, it's important to assess her safety. If there is an immediate threat to her safety and well-being, you need law enforcement to step in. Granted, it's not always a end-all happy ending solution, but that's usually the right channel to go through. Offering personal support and putting her in contact with abuse victim resources is a fantastic way to let the person know that you see that they are hurting, and you want to help them transition out of that toxic environment. Doesn't mean they'll always take that help, but sometimes knowing there's an opportunity is enough to get the ball rolling on things.

Again, speaking as someone who has been in abusive relationships, 10/10 would NOT recommend doing anything with the intent to show her you're a better relationship option. She's going to have to relearn how to be her own person before she can get involved with others, and in many abuse victim cases, professional help is needed to remove the lasting damage that abuse leaves. A friend of mine tried to do that with me when I was trying to separate out of a toxic relationship, and not only was it incredibly selfish of him, but it just laid the groundwork for yet another abusive relationship.