paper like egg shells

my flock = 1 rooster & 2 hens ... rose combed silver laced wyandottes
both hens about 2 yo & have been year around layers
shell on one's eggs have always been a little lighter
past month or show light shells have become lighter and lighter until
now they are white
and so thin that they are are broken when I visit the hen house to
collect them..whether her weight breaks them as she leaves nest, or if
they are broken in laying process I don't know
have been feeding complete Manna Pro laying pellets for years and have
always made crushed oyster shell available... must admit I have not
always been deligent on that & sometimes supply available was exhausted
(my lack of deligence due to the "complete" label causing me to believe
it really wasn't necessary). Two or three weeks ago I read the label
and it said that hens do need addtional oyster shell so I have made
sure since then that it is always available. The problem continues
(one day I did get an unbroken white one from her). How long should
it take to cure the problem if the lack of oyster shell was the
problem? If that was not the problem what are other possibilities?
Other hen has never had the problem nor was it prob with 3rd hen of
same type
which was lost to a hawk last winter.

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