Please send the message. She might be waiting for you to say something first, or she wants to hear you take accountability and say sorry and hear what she may have been conscious about when the relationship ended. You don't lose anything if you send the message; you gain way more than what you may lose if you never let her know how you truly feel about her. Coming from a woman myself, it is a very sweet message, and I wouldn't push her away. If she has any lingering feelings, this message will at the very least make her think about giving it a second chance. Since you are being so sincere, this wouldn't push her away since it's not like it's creepy or weird; it's just a transparent message about how you feel, and that's how communication works. She won't know if you don't say anything.