Fucking her the first time is the "difficult" part as Peb mentioned. Bring the wall down once and after that everything is smooth sailing.

her: i'm sorry, i know, well, i'll be honest with you, i notice that things were moving too fast, and i'm not looking for a relationship right now.
me: ok, well i'll be honest too, i'm looking for one, so if you're not interested in that, i'm sorry but this is a goodbye then.

so yea, that was all, we were looking for diferent things...

Okay, she isn't looking for a husband...Why don't you try to have sex with her with a casual dynamic?

It probably won't work but why not do a Hail Mary and just day "okay, understood, how about we try a casual dynamic instead?" You have nothing to lose.

You could probably word that question better but you probably still get what I mean

then she told me to meet up the next day, and the next day she canceled me because she had troubles with her dad and she was upset, and then she told me to meet up the next day

she called me and told me that a friend's aunt died and she wanted to support her, and then i told here "no worries, she needs you"

I hope this wasn't how you're describing it.
Aw, what a nice guy.

Exactamundo

I wish we lived in a world where some helpful vigilante will turn up with the bang bus limo and provide a logistical solution to guys who can't take the next step.

If I was me, i would of done it in the car, despite the height. Figure it out. Because once you already fucked her. Going to her place or your place is incredibly easier.

I've been dating this girl that i really like for 4 weeks (i'm taking it slow, i'm looking for something stable, and i don't want to rush into something that i'll regret).
The first 2 weeks, everything was awesome, she was very responsive, she introduced me to her friends, i did it too, she showed a lot of interest, she told me that she told to her sister and her mother about me and told me that i make her very happy and those stuff. But this past two weeks, everything changed, every time we chat, she was very cold, she started to show less interest and she started to flake, i asked her out a thursday, and at last minute she canceled it, then she told me to meet up the next day, and the next day she canceled me because she had troubles with her dad and she was upset, and then she told me to meet up the next day, i told her that i'd accept but only if we met earlier because i wanted to do something later (that's because almost all of the times we met, was late because she had some things to do), and she agreed, then, yea, she called me and told me that a friend's aunt died and she wanted to support her, and then i told here "no worries, she needs you", that was on saturday. After a few messages later, we met up last thursday and well, we had plans to go for lunch but when i arrived to pick her up, the battery of my car died, yeah, i know i'm extremely lucky, so i called a crane to pick it up, as we wait, it got late, we didnt have lunch, but she was ok with that, she told me that atleast we saw each other. After that, we talked the next day, and after that, we didn't talked until yesterday.

I forgot to say, everytime we chat, she respond after 2~3 hours, i take like 10 minutes maybe less (i know, i shouldn't do that, but i'm like that, if i hear the phone and i'm free, i'll respond right away, i don't like to make people wait because i don't like the people that makes me wait)

now, i'm not sure what to do, i thought about asking her out this friday, if she can't i would ask her when she have free, arrenge a date, if she flakes, say something like "no worries, let me know when you're free" and don't talk to her until she does, hoping for the best.

what do you guys think?

PD: sorry for my english, i tried to use the translator to make it better =D

i'm taking it slow, i'm looking for something stable, and i don't want to rush into something that i'll regret

what do you guys think?

yeah, it was like i described it hahaha, and of course i had to say that, what else i could say?

I think she's been flaking too much and you should be seriously pursuing other options.