It's understandable if mods are not familiar with canon, however, my only concern is that I do wish that this would be personally brought up in my HMD, so that I, myself, may hash this without with anyone who has concern for my characterization.

I will, however, take this critique into consideration, but I will respectfully disagree with the term "rushed". Considering the relationship with his twin brother, the same could be said of Dante and her. In later terms of canon, she will completely trust Dante, I feel that it's completely reasonable to be receptive that. Now, perhaps, if she had more interaction with Dante, whom has yet to respond to her, outside of her scolding, it can be shown.

However, I must reiterate Lady's youth. Lady is shown to not only be a fiery, headstrong, and persistent girl, she is also naive, idealistic, and judgmental. In short, Lady is still just a kid. Her relationship with Vergil isn't even transcending onto a physical relationship. She regards him as a friend, nothing more. She doesn't seek out anything physical, only once, and only has brought up those sort of matters for a few reasons: