My cousin says that she forgives me for something I did about a year ago, but when I am around her she seems like she has an attitude toward me now. I think she has not forgiven me. Should I bring this up to her or just let it go?
It seems that you already have been patient, waiting for her to reduce the resentment, but it is not happening. It is time to first forgive her for her unforgiveness and then gently approach her about it. It seems that she still has work to do to completely forgive you. You might want to ask her to forgive you and then wait patiently for her to accomplish the task.