Its sounds like she is fine with you. and if she kissed you that is great. what my opinion on what is happening between you do is that you are over analyzing everything that is going on. my advice would be to just relax and not worry if your in the friend zone or not because your not. What probably happened when you told her how you felt was that she was worried you would get attached. and for some girls its a wierd thing. if you want to just be able to like be hooking up with her in a week then just build attraction. dont text her back instead call her back. ask her to come over and help you pack for your trip. if she is attracted to you this is a perfect opportunity for you to build sexual tention. you will be having her do all the telling you what to wear to make you look good in her eyes. dont be afraid to take off your shirt in front of her. be playful with her. touch her. you know stuff like that. when she is leaving after packing kiss her. say something like i am gonna kiss you now. make it a statement as if she has no choice but to say yes. go to the store with her and go to the condom section and grab like 2 big boxes and say i think we are gonna need these for this trip. look in to her eyes and say it with a straight face but use the joke method so that you are also asking the question on if she wants you to get them. or you could also go up to the condoms and be like which one do you like best, we got twisted pleasure, or fire and ice, or her sensations i.e. and whatever she says get a different one and say something about how your gonna be good in bed. then also after that statement grab the one she said.

but dear god man stop over analyzing the situation