Ann is in her car.She is on her way to work.

on her way (to work/home/to somewhere)
在去（单位/家/什么地方）的路上

此处为：在....的路上
她在她去上班的路上
e.g.

1.He is now on his way to London.
他现在正在赴伦敦的途中。
2. He was shot at on his way home.
在回家的路上，有人向他开枪。
3. She is on her way to the farm.
在他去农场的路上。

on one's way to

再去某处的路上

I'm on my way to school.

On her way…“在/去……的路上”；“在来或去的行进中”
原形为：on one's/the way (to)
例句：I'll buy some bread on my/the way home.我最好在回家的路上买些面包

在途中
he is on his way home他在回家的路上

on one"s way 在..的路上

by the way 顺便