YOU SAID:

She was looking kind of dumb with her finger and her thumb in the shape of an 'L' on her forehead

INTO JAPANESE

彼女は、指と親指を額に「L」の形にして、愚かな顔をしていた

BACK INTO ENGLISH

she had a stupid face with her fingers and thumb in the shape of an "L" on her forehead

INTO JAPANESE

彼女は、指と親指を額に「Ｌ」の形にした愚かな顔をしていた

BACK INTO ENGLISH

she had a stupid face with her fingers and thumb in the shape of an "L" on her forehead