Is she losing interest or not? And if she is, why?

Short summary of the situation.
met a girl in tinder… she said hi and we texted a little… took it to snapchat… met for a date… she showed excitement before the date… the date went really well (aka a short lunch became 6h long).
she thanked for the date when we left. I hadn’t even got home when i got a snap saying “thanks again” and then another snap asking when I was free next time. Unfortunately we couldn’t set a date cause she didn’t know her schedule yet for the times were I am free.

She snaped both a “goodnight sleep tight” and a “good morning”… basically all the day after the date she was very active in sending me snaps… she knows why and respects that I can’t answer right away when working. But then suddenly I was left on opened… no big deal… it wasn’t a question or anything like that… just a reaction.

And now another day after her replies was a little blunt compared to before. However she still replied with selfies and not just a pic of a table or anything like that… and she wasn’t delaying her replies either (i mean being active but choosing not to read or reply).

Is she losing interest or what? And why? Why did I do wrong?

Is she losing interest or not? And if she is, why?
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