关于英语句子语法倒装结构的问题

错误,应该是
Waiting for her on the English coast will be her mother,who swam the Channel as a girl.
因为正常语序是 Her mother,who swam the Channel as a girl,will be waiting for her on the English coast.
如果只修改一处应该去掉 to.如果可以修改2处,可以 把 waiting 变 to wait 把 will be 改 is.
如果用 to wait 不应该用 will,应该是 is to wait,表计划,表将来,只有现在计划,没有将来计划,没有将来将来时态.
其中 who swam the Channel as a girl,是定语从句修饰 Her mother.
翻译是：将在英国的岸边等待她的人将是她的妈妈,那个小（女孩的）时候曾游泳横渡运河（/海峡）的人.