Please help is this girl leading me on?

Okay i have known this girl for almost a year and she has always seemed really flirty around me and she was pretty hot so i was cool with it so i started to flirt back with her, but then i got to know her pretty well and she probably has the best personality i know and she is really funny and smart and beautiful, and she always seems to i guess like me and talk to me all the time, so when the summer started i text her up and asked how everything was going and eventually asked her on basically a date and she said yes so we scheduled a movie for tomorrow but im not sure on the time yet and now tonight she hasnt replied to any of my texts for hours and i could tell that she likes me but is she leading me on she just doesnt seem like the kind of girl who would do that she is just to nice please help and give me some advice