<human>: Can you give me the gist of the text in a nutshell?

Hey everyone, first time posting here. First time really confused about something like this. Met this girl from my uni and after talking a bit, we hung out. Grabbed food, coffee, and picked up a sixer to drink at her place on campus. It was a great time and we eventually made out and got under her bra. Eventually said good bye and see ya soon, hopefully lol. Yeah, we were tipsy...

Hung out again a weekish later after trying to find a time when she'd be free (I began feeling maybe she was purposefully blowing me off, but eventually agreed to go out for coffee. Later, we went to the beach and after some walking, made out again, this time sober! Lol. I dropped her off as we both had to be up early. As I walked her to the door, I asked for her out officially for dinner. She said sure, I kissed her, and left. Was feeling good. 

So, now. Couple weeks after that last hang out and having barely talked in the meantime, we have a dinner date Friday evening. I'm wondering if it's worth it for me to go through with it. 

This girl... she'll take hours to respond sometimes, other times the next day or not even at all. Our text convos go nowhere which is why I would barely text her over these past couple weeks apart to ask her to hang out. And in between her long awaited replies, she would "like" stuff I post to Instagram or Facebook. I just don't get it lol. In person, conversation flows pretty naturally. Never felt forced. Is she interested??
<bot>: I like girl, no sure if girl likes me. How can I tell before dropping a decent $40-$50 on a nice dinner. Help me, friendly, knowledgeable people of Reddit...