If she speaks standard Mandarin and your local dialect, she can't be Japanese. According to Japanese pronunciation habits, it is difficult to master the tone sandhi in learning Chinese.

What's your income level?

Japanese housewives can enjoy their husbands' medical care and personal insurance, and after their husbands' death, there are widows' annuities and insurance claims of tens of millions of yen. It's hard to believe that a Japanese girl will be with you if you are not particularly outstanding. If she is willing to give up Japan's superior living environment and come to you, think about why.

What is your girlfriend's Japanese lifestyle?

Diet? Clothes? Do you still like it?