Yes, it does look like it could possibly be lash egg. Are there also bits of hard egg shell in there? How is this chicken behaving? I would be concerned about oviduct damage from the broken shell. I do wonder if that’s what caused the lash egg (if that’s what it is) in the first place. Can you cut that mass open and take another photo?
Lash eggs have a beige look inside. I don’t think that it is a lash egg. But their still may be a problem with her laying. I would give her some calcium for a few days to see if it helps.