My Japanese girlfriend is very excited to see me in Los Angeles, can this delay her period?

I am an American living in Los Angeles and my girlfriend is Japanese living in Japan.

My girlfriend consistently gets her period every 28 days, very rarely does she get it after 29 days but definitely possible. It is now day 30 and she has not had her period yet. She said usually she will have a stomachache or can feel some feelings around her vagina area a day or two before she has her period but she has not any feeling at all, she said absolutely no feelings. I know she is very excited to come to Los Angeles to come see me because we are totally in love and this is her first time coming to Los Angeles, I usually go to Japan about 4 or 5 times a a year to see her and stay with her family for a month or so but this is the first time in her life that she is really excited to travel and see my hometown for a change and to experience all the American culture and stuff.

Now can this delay her period? She said that she likes to take a bath before having her period and that usually makes her period come the next morning. But for the first time, this didn't work for her. I really don't want to see her on her period because it'll be the third time in a row that I have seen her on her period but is she does have her period coming to Los Angeles then we can't have "fun" and we both EQUALLY want to have "fun" together.

Please help me understand this because I have no idea how the period works... I am not a girl. Thank you.