By changing one letter at a time to form different English words, and leaving all other letters in their original positions, convert GIRL into LADY in seven (or fewer) steps. Good luck!

G I R L
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
L A D Y

Here is a seven-step SOLUTION.

A SEVEN-STEP SOLUTION:

GIRL > GILL > BILL > BALL > BALE > BADE > LADE > LADY

Did you come up with a different series of words? Feel free to post your solution in the comments. Thanks!