If she doesn't want to date me or talk as friends, why does she even bother to interact with me and like my photos?

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I asked this question half a year ago about us. Note that I am now 19, she is now 16, and school/personality problems no longer apply.
Old question about her.

Anyways, I waited until she was 16 and I was 19 as I have previously said. In April I asked her to meet up with me to talk about things. You can read it below, but please take note that:
(1.) Instagram Direct was my only way to communicate with her. I didn't have a number nor could I meet her, what I asked to do was to meet her.
(2.) This was not a date, I gave her low risk/cost activities we could do that could be seen as friendly only. I expressed catching up after not having talked in 4+ months. I gave her the option of coffee and going to a local indoor trampoline warehouse.
(3.) I asked this on a Monday, which is why I don't see about her being sick matters. Probably an excuse.

If she doesn't want to date me or talk as friends, why does she even bother to interact with me and like my photos?


Quite obviously, I got rejected for my request. That didn't matter too much to me. What matters is she was very ambigious with her answer (there wasn't a straight "yes" or "no") and now she's ambigious with her behavior.

PB has always liked my pics on Instagram (yes I know this stupid but for a 16 y/o girl this is how you flirt) and still does even she rejected me.
This is what I'm asking about. If she doesn't want to date me or even meet up to talk as friends, why would she bother to still interact with me? Wouldn't that just be a waste of time on her part and wouldn't she know that would give me iffy signals? Should I even bother to interact back, or is a lost cause? Should I try again?

Thank you to anyone who is taking the time to help me and who read the other question first.
If she doesn't want to date me or talk as friends, why does she even bother to interact with me and like my photos?
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