happened to meet her by chance
町で偶然彼女に会った。
I ran into her in town by chance.
彼はそこで偶然彼女に会った。
He happened to run into her there.
家を出たとたん、通りで偶然彼女に会った。
The moment I left the house, I happened to run into her on the street.
電車の中で偶然彼女に会った。
I ran into her by chance on the train.
昨日ある料理店で偶然彼女に会った。
I happened to run into her at a restaurant yesterday.