YOU SAID:

I don't know how much longer I can keep her from injuring herself!

INTO JAPANESE

彼女が自分自身を傷つけないようにすることができるかどうかはわかりません！

BACK INTO ENGLISH

I don't know if she can prevent her from being hurt!

INTO JAPANESE

彼女が彼女を傷つけるのを防ぐことができるかどうか、私は知りません！

BACK INTO ENGLISH

I don't know if she can prevent her from being hurt!