She gave you 3 chances to hit it. You declined. This is not HS. She is a grown ass woman now. She does not want or need you to protect the sanctity of her vagina. There is a decent chance that the only reason she reached out in the first place was that she just wanted some D.
Sigh..........One more time for all you retards out there:
First base, second base, third base, home. It's your job to run the bases. It's her job to call you out. It's just like an MMA bout, you pursue until you are told to stop.
There is a fundamental reason to never deviate from this path. Which brings me to the advice part:
You made this girl think you were interested with your words. But you convinced her you were NOT interested with your actions. More accurately, lack of them. In short, you rejected her. 3 fucking times. The response you are getting now is that of a woman dealing with rejection.
Try and think of it this way. Remember back when you were trying to fuck a girl, but were shot down. Maybe she shot you down when you tried to take off her shirt. Maybe it was when you started feeling her downstairs. Maybe it was when you put her hand on your cock. Whenever it was, once you were shut down, the first thing you felt was frustration. (I wanted to get laid and didn't-fuck). Then you were hit with a small wave of anger and disappointment at being rejected ( This girl does not want to have sex with me- Fuck her).
At this point, most girls are intuitive enough to know that they have opened up a wound, and if they are interested in you, they need to balm it. So you hear things like, 'I really like you but this is a little to fast for me'. 'Lets's wait a little bit.' or even the patented, 'Sorry, Aunt Flo is visiting this week.' All of this is meant to convince you that while you may be frustrated, you should not feel rejected. In fact, you should feel encouraged to try again. Which, of course, you do.
Now, to appreciate the magnitude of your sin, lets look at this from the other side. To reject you, a woman has to shut down a request, whether it is a date invitation or trying to get in her pants. But for you to reject that same woman, all you have to do is not ask her to dinner or not try to get in her pants. The fact that you have not progressed things gives her no hope for the future. You have given her no reason to try again.
Making out with this woman all night on the 3rd date with no attempt to fuck her was the ultimate rejection to her. She spent that entire time thinking, 'Why is he not trying to fuck me. What's wrong with me? What's wrong with him? FUCK!! '. And women take that shit a lot harder than men. Even if she did not want to fuck you, I promise you that she wanted you to try.
I agree with your chick friend that you should wait a few days before reaching out. But when you do reach out, if at all practical, it should be in the form of a booty call. You have already put in a lot of hard work convincing this chick you don't want to fuck her. To have any chance, You are going to need to do something bracing to change that narrative.