Honestly you don’t really know her that well. There might be ton of reasons for her doing this or that. I also think you might have come in too strong. You barely know her yet offered to pay for her tickets, offered to support her, offered to move her in, sent cards and packages and you literally barely know her. I know you mean well but for many women it would come across as love bombing and would be rather unsettling and might even seem dangerous. I recommend to proceed slowly when you meet new dating prospects.

I personally would probably block a man if he said he is going to look up my sister especially if I barely knew him. It all sounds very intense and somewhat scary. Again not your intentions of course but I am pretty certain things like that creeped her out

You have a lot to offer but you might scare people off before they give you a chance.