Was she doing ok before you gave her a bath?
Where did you feel the lump, right below the vent or between the legs in front?
Was her crop not emptying?
She's pooping, so very unlikely she's egg bound. At 5yrs, she may be suffering a reproductive disorder, which one, it would be hard to know.
I would work on hydration and getting her to eat. Make sure her crop is emptying overnight, if it's not, then treat that. Article below.
Pumpkin seeds do not treat worms. If you want to deworm, then use Safeguard or Valbazen.
You are probably at the point where offering supportive care is all you can do. I would leave her with her buddy in the coop/run even if she is just moping about. Being separated is more stressful.