how to find out if this one girl in my class likes me?

ok there is this one girl in my last class and i dont know her and she is new in my school, by the way im in 7th grade, so we never really talked or made contact and there's only 9 people in that class and we all ways talk but she is kinda quite but then this week are teacher said we could start siting were we want, Btw we are kinda bad in her class so yea. and she normally sits by her self and i sat down and she for some reason sat by me and she said hay and i said so hows your day and we talked for about two mins then when we started are book work she got up before me and got my book and then she took it off my desk before i went to put it back and shes been doing this all week and we talked a few times about school stuff thats it and she keeps siting next to me like today my friend was about to sit by me then she sat down before my friend got in class and she has girl friends in the class so i do not know why she siting by me and she keeps being nice, not that shes mean you know its like when your that person that you hate just starts being nice to you not that so hates me ether and i keep seeing here looking it me in my watch reflection, so just what to know how to find out if she likes my without asking here like, "do you like me you know i just want to know because i kinda think she looks good if i knew she liked me i would ask here out well there's other girls to that i think kinda like me and i have girl .. friends to