my turtles leg is extremly swollen

Question
what do to make her eat! and what shouuld i do afterwards?
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-----Question-----
she refuses to eat and the bottom of her shell is also swollen and appears to be filled with puss! whats wrong with her?
-----Answer-----
Swollen leg is usually the result of a big infection- either due to a wound, injury, dirty water, etc.

Unfortunately, there is not a ton the average keeper can do in this case. You can try the advice here: http://www.austinsturtlepage.com/Care/medshell.htm

However, you probably should be shopping for a good vet. Badly swollen limbs can jeopardize the life of the turtle pretty easily.

Answer
Keep the priorities straight. She will not eat if very ill- neither would you. You've got to get treatment going for the swelling and puss first. Once that is feeling better, she'll probably start to eat again.

Turtles can go a while without food if they have to or don't feel well. The best way to get them to eat again is to fix what is broken- in this case, the leg.