I think it is not good to apply a skin cream on a kid that old, though you can use sunscreen as they are moisturizing and also prevents sun darkening of skin.

Hi Alaika, she is a 7 year old kid only so give her nutritious food and proper exercises or even yoga can help. Else, height is something that depends on the genetics. I am also short with only 5 feet. :) You can try applying besan paste on her forehead and then scrub it off when it gets dry. I had too many hair on my hands and my mom use to do that which has shown good results.