For what it is worth I later learned that it was her graduation celebration dinner with her sis.
Well, then the other option could be - it wasn't just any dinner, maybe it was an important occasion for her and she didn't have time to text with you.
Btw, I've noticed the British often complain about how "blunt" Poles are. Are you British or American?
Can different religions be a big issue with polish girls?
Um... Why, are you going to propose to her? ;D Just kidding :)
"Polish girls"... Jesus... Listen, I know this may be a shocker for some people, but there are all kinds of Polish girls out there - for some it may be an issue, for others - not at all.
Why, do you know she's religious or sth?
Another thing - where do you both live? The UK or USA? Is she born Polish or Polish-American? Not enough data to process lol
I was still wishfully thinking that there might be a hope still
Well, you could try to ask her out again. Have you even asked her whether she has a boyfriend?