You decide that you are not a champion and the hero thing really isn't your shtick. You enjoy doing good, and not being a jerk, and money is not as important as getting by, but that does not mean you're a paladin.
You let go of her hands and gently touch her on the shoulder.
"With all respect, I killed nothing in the name of your goddess. I did what was needed. That's all." Pause for dramatic effect. "I honor your goddess, and I thank her daily for the help she gave me. But I am no priest, and no champion, and I will not come with you."
She continues to smile as if she did not hear you. She leans in strangely close and softly kisses your forehead before stepping back out of reach. She smells like spring, clean sheets, and ... you snap out of it as she starts talking.
"Your choices are your own, because your words and choices even unknown to you are the choices of our goddess, just as mine are. She guides your steps even as you plant your feet. May I, and a few of my sisters be allowed to set up a true shrine in that wicked tower, for the weak and weary? It will make this town prosper with travelers."