What do most guys do as soon as they meet a REALLY HOT, ultra-attractive woman?
Of course! They call three times a day, and want to see her all the time.
Attractive women know better than to do this.
When an attractive woman meets a man she likes, she usually PLAYS HARD TO GET. Instead of calling, she acts like she's BUSY.
This makes the man try even harder, and pursue her even more...
It sounds like you did exactly the opposite.
In your email here you say:
"Well, over the next two weeks or so, I kept coming over and doing things during the days with her and staying at night. This is when things began to change..."
No no no!
Over the next two weeks you should have called her every few days, and seen her maybe three times for a few hours each.
No "doing things during the days with her and staying at night"!
You really need to remember to GIVE HER THE GIFT OF MISSING YOU!
If you're around all the time, you become predictable, expected, and uninteresting.
On the other hand, if you're mysterious, challenging, and hard to pin down, she will think about you and miss the times she's had with you.
DON'T TURN INTO A WUSSYYYYYYYY...
This is one of the biggest mistakes that men make when they meet a woman that they REALLY like.
As I'm sure you can guess, this is bad bad bad for attraction.
When you start out by doing things that are attractive to her, then gradually turn into a WUSS BAG, you go from her wildest dream to her worst nightmare right in front of her eyes.
If you figure out how to make a woman feel ATTRACTION for you, then KEEP DOING WHAT YOU'RE DOING!
Don't start being a clingy Wuss. Translation: Don't spend every day and night with her, don't buy her groceries, and don't try to get her into a relationship fifteen minutes after you meet her.
You also mentioned a few little words that stood out for me: "I kept coming over...".
YOU kept coming over. When you're the one coming to her, then she's the one in control. Think about it. This is a small point, and it isn't always the case, but in this situation it makes a difference.
So, what should you do now?
You should give her some space. Don't call her more than once or twice a week, and don't see her more than once or twice a week for awhile. Don't pressure her physically, and don't try to push for a relationship.
DATE OTHER WOMEN! Get out there and go out with some other women... and when you talk to her don't hide the fact that you're doing it. Be casual about it, but feel free to mention it in conversation once or twice.
GET ON WITH YOUR LIFE
Don't get hung up, don't obsess about her, and don't make it important to "win her back". Just move on.
This combination will give you the greatest chance of winning her back...
And the next time you meet a beautiful woman that has an interesting personality, DON'T TURN INTO A PREDICTABLE, BORING, CLINGY, WUSSY!