Your hen laying and hatching is a super great sign! Some of my hens laid extremely similar eggs, so I was unable to determine if my hen who eventually died from it did or did not ever lay a regular egg after laying lash material, though I suspect she laid a few.
My hen who had it laid 3-4 lash eggs over the span of a couple of years. She looked happy and healthy, and I didn't know what was wrong until after a necropsy, so I had to put two and two together. She acted perfectly fine, eating and drinking, very active. The only noticeable difference was that she was quite a lot heavier than she should have been after a while, but not gaining any fat, and her abdomen was hard. In the end, she was slowly crushed from the inside out by more than one lash egg the size of my fist. If I had known, I would have put her to sleep. As it is, she slowly suffocated over the course of a few short days, and passed on her own in her sleep. She was 5 or 6 years old. Best I suspected was eggbinding or waterbelly before she actually died. Either way, up until the week or two before she died, she lived a normal chicken life.
