Oh wow..Yeah I didnt read that part. Your turtle definitley needs more space. 5 gallons is not suitable, not even for a baby turtle. Like kristen said, 60 gallons is what you will need, however it is 10 gallons of water per every inch of your turtle, so I would start looking for a bigger tank..probably one around 100 gallons so that it could last you forever.
Are you taking her to get xrayed? I'm realy worried about that gravel..are you taking it out?
What makes turtles happy is a ton of space to swim around in and nice quiet time to themselves, and good food of course!
