"Easily influenced girl" in Engpsh.
Its origin can be traced back to the common use of the phrase to describe someone, usually a young woman, who is easily swayed by others' opinions, suggestions, or decisions.
Here are some Engpsh examples with Chinese translations:
She's such an easily influenced girl, she can never make up her own mind.
他是一个很容易受影响的女孩，她永远不能做出自己的决定。
My pttle sister is an easily influenced girl, she always follows the latest fashion trends.
我的妹妹是一个很容易受影响的女孩，她总是追随最新的时尚潮流。