LV01 - First, thank you.
Second, what you should do depends largely upon what you are able to do. There is no set answer for every person. What are you comfortable doing, and what does love motivate you to do? That is what you should do. I don't think you can fake it. For example, and using your example: Such as saying, "I should go to this party and be around this toxic girl because I think that would show love, and she wants me to go," but at the same time not really wanting to go.
Let love motivate your decisions. "This girl has no one to show her what love truly is, and she has no true friends. Perhaps she is mean and bitter because of it. I might not ever be friends with her, but I will go and try and show her some kindness, simply because she needs someone to do that. She needs someone to show her what love is supposed to look like."
Then you're going because you want to go, because love or sympathy or compassion has motivated you to go.
At the same time, if nothing motivates you to go, it does not mean you don't have love. Perhaps love motivates you to be kind when circumstances force you to be around this person, but you cannot be around a toxic person by choice. It all depends on you. Love also grows from love; what you might not be capable of today, you might be capable of doing tomorrow. Just act sincerely... rather than out of what you think love is supposed to act like. I don't think showing love means being a doormat, either.
Even Christ spoke for (defended) himself at times. He also left areas/people that would not welcome him, and instructed his disciples to do the same.
I, personally, do not go out of my way to be with toxic people. I hope they find peace and happiness, and if I am around them, I will do my best to be kind show compassion. But I will not permit myself to be abused. I will leave if that is happening. Showing compassion and keeping your calm is easier to do when you realize that who you are is not dictated by what someone else thinks of you. Especially someone else who is so unhappy, that what comes out of them is anger, bitterness, and 'toxicity'. I would make more of an exception for family, but I already love them and have a vested interest in helping them. I would still defend myself from abuse, and/or leave an abusive situation, though.
Hope that helps,
Tammy