Definitely not eggs. She looks to be backed up as others have said and what you are feeling is urates. Keep her hydrated and try offering a small live meal. Also, keep meals small for a while so her system can recover. A trip to the vet would be best. If she's not eating due to parasites then she might not recover since she's in such a poor state but if she's just malnourished due to neglect then she should bounce back after a few meals and soaks. They are very resilient animals. Good luck with her and glad she found a good home.