It's not necessary to over-think every single text that you get. She asked what you were doing - you said whatever you want. If she didn't want to hang out with you, she wouldn't have asked. Is it a date? I don't know. You should ask her when you suggest something you guys could do together. If you have a question about someone's behavior or words, ask them - work it through with them. You'll both come away with a better understanding of each other.