Oh man, it's heartbreaking because she's is actually aware of the clinginess, and is trying to work on it.

But that's also a good thing, and might be a good jumping off point for you? If she acknowledges that this is a problem, can the two of you sit down and talk very openly about these boundaries (with conditions of having to block her for your own mental health if things get out of hand again)?

I mean, it's not a pleasant conversation to have, any way you look at it, but she sounds like she might be open to that conversation, and would understand if you were to say, "Okay, but if you start doing this and that too much, I will need to distance myself again." Of course, this would all be said with emphasis on really, REALLY not wanting it to come to that.

Beyond that, I don't know. She does sound like you two could be good for each other, so long as you both are clear on what your boundaries are. Good luck, Lark!