An egg passing through quickly like that, with no attempt at a shell forming may be egg drop syndrome. It does not show any other symptoms. Did your hen get vaccinated against it? Also how long has she been laying these?
I have a Flower Hen that has just started to lay soft shelled eggs. She's just turned a year and one of my favorite layers. Her eggs are usually just beautiful but a couple months ago the eggs started to have a small spot on the fat end that looks like thinner shell. Yesterday I saw her drop an egg on the go that just had a rubbery soft shell. Also, the girls are on SS layer feed with oyster shell always available. Can/should I vaccinate adult birds? How long is the egg withdraw after?