Thanks for replying.
I didn't asked her why she acted like that, so she can't reply a question she hasn't been asked about. And I didn't asked her because doesn't worth.
However, I thought someone who knows japanese culture better than me could help me to understand the reason she ghosted. For example, when I was a begginer in japanese, I usually used 俺 because some anime characters do and I found it cool but I didn't know it may be impolite and once, another japanese girl got bothered because I used 俺 when talking to her. She didn't say anything… only I noticed she wasn't comfortable but I didn't know the reason. About some weeks later, I noticed 俺 is not the best way to talk about myself if I talk with a girl, specially if she isn't someone who has confidence with me (and that explained all, because first times I met her I used 私 and she acted natural, but when I used 俺 she tried to act friendly but I noticed about she felt uncomfortable). Then I understood my mistake, even she never told me "don't use 俺".
In the same way I discovered why the other girl got uncomfortable without talking with her about but learning more japanese, I thought someone here may help me to understand why this girl ghosted if I told the details and there are a cultural shock.
Mdchachi said it may be because I paid. It may be a clue. Now I need to know if for japanese people, paying is clearly a way of showing dating interest.
Thomas told me to not care about it, but I think I should. Not because that girl is important for me but if a commited some mistake, I dont't want to make the same mistake again next time I met with japanese people, male or female (I am not sure if me being male and she being female has influenced her to ghosting since I don't know anything about her reasons to do so).
Best regards