Seen from the result, Eve, before the fall could have become either a tree of goodness by accomplishing the purpose of creation, or a tree of evil by falling, not keeping God's commandment. This is the reason Eve was likened to a tree of good and evil.
Similarly, Eve's love before the fall could have become either a good or bad fruit, accomplishing the purpose of creation or causing the fall, and thus her love was likened to a fruit of good and evil.