a real good 23" tennis racket for my daughter? She is 5 going on6 and can already rally and is showing some real ability. I'd like to get her something besides the Walmart or Sports Authority aluminum racket for $19.95. Is there a real good framed racket out there that is 23 inches? Any suggestions on strings that would be easy on the arm as to stay away from injuries. My apologies if these are stupid questions, I just don't know much about tennis.