@spawn23,
She might not see you the way you see her. She's just left school, started a career, may just want to hang out with her girlfriends, earn some money, not yet interested in relationships, she's only 16.
It's good that you make her laugh and she enjoys your Company, never do things via text as in asking a girl out, a bit of flirting which makes a girl smile or laugh via text is ok but to ask a girl out, you have to 'ASK' her in person.
It's only been a month, keep making her laugh and let her get to know you, slowly slowly catchy monkey...as they say.