<human>: Condense the text into a few key points

Last week, I met a girl at a small get-together. Even though we our conversation was short, I felt like we clicked. She seemed genuinely interested in the things I had to say, and she didn't seem to be put-off by anything. I was really casual during the conversation, but before I left, I completely forgot about asking for her number.

I eventually added her on facebook, and when I asked for her number, she asked for my number instead. Being the skeptic that I am, I took that as she wasn't interested. A few days later, she texted me. Our text conversation has been sporadic, as our replies to each other are pretty spaced out (by hours, and sometimes a couple days). I mentioned getting coffee with her, and she was interested, but she hasn't said anything about it since I've been busy with graduate school, and her with work. 

If I were to text her again about coffee, would that be too forward? How do I approach this situation? I don't want feel suffocating or needy, but it's hard when there's a lack of communication.
<bot>: I want to ask a girl to coffee without seeming too bothersome or needy. How do I do so even when our text conversations are so spread out?