感激涕零,A clear picture was formed in her mind of how she would

感激涕零,
A clear picture was formed in her mind of how she would look in twenty years' time.（image)
要用到image这个词,改写这个句子,保持相同的意思,用定语从句的方式表述.我是这样改的,
She has a clear image that is how she would look in twenty years' time.
这里先行词是image,that在定语从句中做主语,这样改对吗?