In this case, I believe she meant shell-less eggs or normal eggs with only a membrane, missing a shell. Lash eggs are usually solid or semi-solid flesh colored things from salpingitis inflammation of the oviduct.
Do you know the age of these hens since you are the third owner? The hen may be having a reproductive disorder or may be nearing the end of laying. They may start molting in late summer, and that can cause changes in laying. Giving her calcium citrate with d, about 300-600 mg daily for 7 days...