Hello,
Thanks for the pictures of the setup.
Which brand of tube bulb are you using now, the Reptisun 10? One thing you could do would
be to mount the long tube bulb directly overhead & underneath of the screen top to increase the
UVB exposure for her. The UVB reflects downward towards her when mounted overhead but
doesn't reflect onto her very well when mounted on the back wall.
A 4 foot tank is a great size! What are the temperatures in the tank?
I am thinking she has developed pseudo gout which is just caused by nutritional issues like not
absorbing her calcium & other vitamins properly. That is most likely caused by the
UVB light
placement but this can be remedied to where she wont develop full blown gout.
Let us know how she is doing.
Tracie