how do u know if you should forgive your friend??

You should forgive your friend by asking yourself, "Would it be a good idea? I mean after what happened is she still a good person?". If she's begging for forgiveness you could forgive her. What are you forgiving her for? Doing something bad? Picking arguements?

If it was in a situation like she spooked your birds, and you said you dont want her to come to your house, she will be begging for forgiveness. You could say something like, you need to prove worthy or something