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Why does a girl cancel the date, when I've already made out with her? I know there are some threads about it, so feel free to place my thread anywhere else

So here's my story:
I met this girl (let's name her N.) on saturday night in a nice club in the city where I live (Germany). I wasn't going out alone but with three buddies of mine. One of them is a big boss at the local mall and the other guy seemed to have high value, since he's every weekend in this club and knows many frequenting girls there. We were having fun dancing and then I started to approach girls on the dancefloor after a few drinks the boss bought for us. Then this girl (a five) came with her friend (also a five) and started to talk to us because one of them was working at the mall and her boss was there.

So first I ignored this girl because of other options (was already gaming on a hot mexican (eight) and her polish friend (seven). So this first girl (N.) started to show she's interested in me, she was asking questions about my age, job and other shit an interested girl wouldn't even bother asking. I asked her to guess my age (21) and she said I looked like 19 (don't know if it's a good sign). So she said that she turned 21 that night. Then these two chicks disappeared to meet their friends. After 20 minutes we met them again and started dancing. I was dancing with the second and started touching, so it drove the N. crazy.

TL;DR later on I was making out with N. She gave me her number though I didn't ask for it (yet), "so we can find each other in case we separate" (that club was huge, with 3 dance floors). The logistics wasn't going to work for me, because I drank too much that evening and my buddy lived two blocks away, but she said that I have to call her the next day, which I didn't want to do.

I called her on monday at 8 p.m. and she picked up the phone in the first second (I was shocked, because I expected that she wouldn't pick up and I'd have to play this funny back and forth phone game). First thing she asked me was: "so you found a strange number in your phone and wanted to figure out who it was?". I said: "yeah, but I usually call the people that I enter in my contact list, so it's nothing special". I did some smalltalk with her and I think the first false move I made was telling her: "oh, of course you had birthday on saturday, cool" after she said that she was celebrating with her granny on sunday (i was too cocky and a little bit disrespectful). I invited her for some drinks on tuesday and I didn't want to make that anti flake move so I decided to tell her the exact place and time we should meet. She said that she had to work on wednesday so I said it wouldn't take too much time. She agreed.

On the next day (tuesday) she sent me a message where she canceled. I was disappointed though I knew it could happen. But I wasn't depressed and partied all night with my friends. I didn't give a f*ck about this chick and didn't reply since that.

I know it's not cool to ask before I decide to move on, but I think I should move on, because i'm planning to visit Ukraine for two weeks and since I'm russian, I'm not going to have any language barriers there. There are many girls thet already know that they'll have german guests => oh yeah, say hello to my pussy!

Sorry for the long text, but here's my question: what did I miss, what went wrong with this chick (N.) I'm an average looking russian guy, I go to gym and I don't have fears to approach though I have some acne scars. My english is bad, I know...