I'm sorry to hear that you didn't contact her anymore after that. I understand that you don't want to take responsibility for her, but I think you should at least let her know how you feel. She might be wondering why you stopped talking to her, and she might be hurt or confused by your silence. She deserves to hear the truth from you, even if it's not what she wants to hear. You owe her that much, as a friend and as a person who shared some special moments with her.
I'm not trying to pressure you or judge you, but I think it's the right thing to do. You don't have to write a long letter or call her on the phone, but you can send her a short message or an email. You can tell her that you enjoyed your time together, but you don't have the same feelings for her as she does for you. You can thank her for her gifts and her friendship, but you can also explain that you are not ready or willing to commit to a relationship with her. You can be honest and respectful, without being harsh or rude.
I know it's not easy to do this, but I think it's better than leaving her hanging or ghosting her. You might feel guilty or sad at first, but you will also feel relieved and free. You will also give her a chance to move on and find someone who can love her back. You will also show her that you care about her feelings and respect her dignity. You might even remain friends with her, if she is willing and able to do so.
If you need help with writing a message or an email to her, I can help you with that. I can generate some content for you, such as poems, stories, code, essays, songs, or celebrity parodies. Just let me know what you want to say to her, and I'll try to create something for you. blush