You missed the first window of opportunity already, but I will grant (as well as for myself, cause I'm in these kind of situations, somewhat, myself) that it was rather complex and she was going all over the place.
Right now there is already grief on both sides.
She might act all playful and foolish but perhaps you can get her a little bit more serious.
You might *even* just tell her you want to talk to her because you like her.
You need to get her exaggerative wildness toned down a bit. That is also what will make her like you, I believe, because if she is always like that, she is going to grow tired of herself. So if you can actually get her to calm (do not use that word) or tone down a bit, as in "okay, now serious".
You can still make jokes about your cock.
"Okay so about my cock. I was going to say to you that I'm ... not sure you can have it yet."
In fact, this is the thing you most need to do. Tell her you're not sure what she needs to do to get it. She has expressed an interest but surely it won't be free.
Even just saying these things will make the kiss close come closer. So do you what you like. What do you want her to do for it? At least play with these things you know.
But do it in person.
Maybe she needs to softly kiss you on your right cheek. "Well, that is good. .." "Do you think that was... an appropriate thing to do for it?

" "How about my left cheek.... softly now this time." You want her to become less exuberant, which she likes in you if she can be quiet. So make her give you an extra soft kiss.
"Do you think you can do the same on my lips? I'm not sure you can".
She might even cry after kissing you. Or you will. How should I know ?

.
I had this girl in my room lately... she is not that attractive, but fun and small. My feet are broken so it is hard to stand up and kiss her. The one time I stood up and embraced her and kissed her cheek she immediately turned away avoiding me really as if she was really nervous. Now she is rampaging through the halls complaining it is so boring here. Stupid girl.
Girls often don't know when they are (a tad) heartbroken. They will come up with any excuse they can for not seeing you anymore but they don't *really* realize what has changed. And it's hard to speak of it because "heartbroken" might just be too strongly put. A girl might also decide that she is going to wait for better circumstances.
Since you failed to kiss her (in her mind) she is going to assume you won't be doing it if she gave you another chance (or herself) so she's just giving up on you
for now. She might still hint at other "longer term" stuff. But you failed to get her in bed when she wanted it. You might also say that SHE failed to get herself in your bed. But girls become angry at the guy, and then you become angry at the girl for being a turd and finding any excuse she can for avoiding her feelings.
Avoiding you.
Funny that a girl who screams "I want sex" is too nervous to come close enough. And just outright stupid that she then starts exclaiming she wants a lover. But it's clear she puts you out of her mind, or tries to (mostly the latter thing). I usually just become an annoying prick and start teasing her. My way of being angry and a little bit insulting and at the same time teasing her to come back. You sometimes see her reconsider.
I also don't know what to do. Let's say we didn't cross the comfortability barrier. In time. Now it's over. She'll probably express an interest when we have to say goodbye and she will hope something comes outside of this institution. When a woman's disappointment is getting triggered, boy that's strong(?).
Maybe I'm doing something wrong, tell me. I would think she is a 6, but a funny package. She is also a lying and thieving addict. And she crossed the line with me when she said she wouldn't steal from me. That reads to me like "I am going to steal from you when I get the chance". I still have to get real with her on that last occasion. "Hey about that one time.... I don't want you to lie to me."
I generally detest smokers anyway. A smoker (girl) will at the same time feel inferior and not worthy enough to get with a non-smoker, and at the same she will feel superior and only want to associate with fellow smokers. The end result is that she spends way more time associating with smokers (because of her habit) (and because institutions still tend to make special allowances for the smoking crowd) and I'm like, how dare you walk away on me like that ALL THE TIME

. "Yeah.... I need to smoke." Each and every time. Of course they are just excuses and she knows for 90% that they are, but it still has a powerful grip on her.
You can lock people into a mode of feeling bad about themselves. The worse they feel, the less they are going to show up at your doorstep. Anyway, enough with my rambling.