Mostly people want things. However, when it concerns other people and people to people connections in various way, there are always 2 parts deciding, if not gang bang or threesome. She might very well be interested in you, but she might also only want company for the specific occasion.
You are the one that decides how the night will end for you. If she agrees to sleep with you, then so be it. If you wish to sleep with her and she says no, then just try another one. Same as you say, if you just want to float a kratong, and go out eat with her. Go for it. It´s not like you can´t say no, and she will rape the man out of you.