My gut tells me that you are the classic "Fallback Guy".
She might not admit it, but theres a good chance that she had "something else" going on and decided to shift gears towards another man. Hence, she blows you off and decides to start paying attention to "something better". Something might have happened with this other dude, and now she decides to go back to you.
The Fallback guy.
Now, I hear from her out of nowhere the other night and she's all apologetic about the way she ended things, saying she was scared of how much she liked me
Ignore this type of rheteric. It is simply excuses for something else. This situation does not exist in the Real World of grown up, mature adults.
She was involved in a sort of accident at her party that I think shook her up some
Can you describe the accident?