Replying to NS, I need some advice

So my girlfriend broke up with me in October after dating for 3 years. She just started college and I was a Junior and she found some more exciting things than me (typical sorority girl). Well, we stopped talking for good in January, and once school ended she started sending me some texts again in May because of boredom I'm assuming. Well, I should have just ignored her but I didn't and added her on snapchat. Well here is where I'm getting really confused. I'll send her a snap and she'll text me instead of snapping me back and ask me if I'm staying down at my apartment tonight at school because she's living down there close to mine, so trying to subtly ask if I want to do something but not outright saying it. If I say no, she doesn't even respond to me, so wtf does she want???