Ancona/Tumour Mystery

I have posted about Zsa Zsa before, bald bum etc  and she stopped laying Thought it was eggbound but took her back to breeder  who said the hard lump was a tumour  I decide to keep her anyway.  Along with the others I gave her ACV/tonic/Poultry Spice etc.  She has moulted and turned into a real beauty, sleeky black feathers with a white head and her bum feathers have grown back too.

Tonight I picked her up as she is quite tame and sits on my knee to eat the corn  and guess what??  The lump had gone!!!!  Nothing in or below her vent.

Has anyone ever experienced this ?? Do you think she might start laying again??

Thanks ...perhaps it was   It just seems so weird  & I am SO glad I didnt let the breeder cull her.  Even if she doent lay again she is a lovely bird  and I am happy to keep her.