Answer:
# Theoretically, the height of Sandy must be an odd numbers, and not less than 5.
It may be: 7,9,11,....
# However, as 1 inch for the height of a girl is too funny - Marie can not have a height of 1 inch ( only in the case Marie and Sandy are the names of the toys!) - you should choose the number that fits best to the human height.
Explanation:
Please see the explanation for the answer in the picture attached below.