Looking for lost friend -Chikako Yoshioka (Tampo)

Help Find a Friend Chikako Yoshioka (Tampo)

I am looking for a long lost friend that stayed with me as an exchange student in Napier, New Zealand in 1983. She went to my school Napier Girls High School.
Her name was Chikako Tampo then. She married Toshi Yoshioka. Back then she lived in Nishi, Sapporo. I visited her there. I think they moved to Tokyo. They had 2 children Non-chan and Hana-chan.
Chikako's brother was called Hideki Tampo married to Yuko. Chikako's parents lived in Tomokomai.
She came to NZ with another two students -Myumi and can't remember name of the other. Can anyone help or point me in right direction?

Do you know her or her brother's kanji name? Tampo (probably 丹保 or 丹甫) is a rare surname, so if you know their kanji given names, it might not be impossible to find out her.