I need help trying to figure out what is wrong with my daughter's turtle. We have had this turtle for about 3 years along with her sister. We got them when they were about the size of a half dollar. She is about 5 inches long and has always been healthy. 2 days ago she just kind of started floating around in the tank and has not been eating. She does not seem to get out of the water to bask either. Her eyes look fine, no mucus from the eyes or mouth, not floating to one side....all in all looks healthy. Could she be constipated? Any ideas?
Thank you in advance for your help.
How big is your turtle? about 5 inches
How long have you had it? 3 years
What is the water temperature? 78-80
Did you use a thermometer? yes
Are you using a water heater? yes
How much water is in there? ~12 gallons
Are you using a water conditioner? yes
Are you using any filtration? yes
What is the basking temperature? ~ 80-90
Is there a basking light?yes
Is there a basking platform that is easy to climb on? yes
What kind is it or what is it made out of? resin
Is there a UVB light? yes
What have you been trying to feed it? pellets
When was the last time your turtle ate? about 2 days ago
How big is the tank/pond/enclosure? 30 or 40 gallons (I can't remember)
Is the tank near a window? Yes, but the shade is always closed.
Is the tank in a room with a lot of activity? no
Have you read the Basic Care section? yes
Have you searched the forums for similar situations? yes
Is there any other unusual activity/symptoms?

