<human>: Could you distill the essence of the text into 1-3 sentences?

Sorry for long post, but I think the background is somehow important... 

Me [19] and her [17] met around 9 months ago. Went on two sort of dates ending with kissing. She lives far away so we're not seeing each other. So we text through messenger. 
She's flirty sometimes. She wrote me twice she's not wearing anything rn,but it was few months back. We have set nicknames which we gave each other. She's something along the meaning of "naughty girl" and she likes that nickname. 

The problem is I'm pretty much always the one who texts first. And she's sometimes off the phone, so she will answer sometimes days after I send "hi". She tells me how some teacher was hitting on her, which she found funny and how others think she's dating her friend which makes her upset. And recently she told me about her ex and that he's texting her sometimes and that he's an idiot. But she seemed a bit excited about it, but that's just how it seemed to me through what she wrote me. 

I've asked her if she wants to meet up, because I will be in the same city. She told me she didn't know if she would have time, that they have some events with her class,but that maybe she will go. And that she can't Thursday and Friday for sure but doesn't know what about Tuesday and Wednesday yet. Few days later she says she can't make it. The thing is that I'm not sure if she is just being polite or she really can't make it... Should I ask her upfront if she just didn't want to go and was too polite to put it that way? I'm confused and I really like her, so I'm not sure if she's interested in me or not or she's just enjoying my interest... 

Thanks for reading
<bot>: Pretty much the title. Should I ask her upfront if she just didn't want to go and was too polite to put it that way?