I got an egg with a soft shell!??

[ChickenShepherd_6116]

I have one 5yo ISA Brown (among other breeds) and this morning she laid for the first time in like 2mo. I don't know if she has been eating her eggs (I know I have at least one mystery egg eater) or if she just hasn't been laying. This morning, when I went out to collect eggs, I was really excited to see an ISA Brown egg, only to pick it up and realize that the shell is soft and squishy! The side seem a little harder, but the two ends are super soft. I can send a picture of the egg, but it looks normal except that it is soft; it's also a bit more round than usual (this hen usually lays longer eggs). She is currently eating Purina Starter Crumbles because I have pullets living with my layers. She has access to oyster shells (I've always used that as calcium, even before the pullets), food, and water 24/7. The run is large, so it's not because of overcrowding. The coop is clean, so it's not that. The pullets have been living with her for like 4 weeks now, so it's not that change. Maybe it's her age?? I don't know, I'm at a loss here.
Any tips or knowledge on this is greatly appreciated!

 

[oldhenlikesdogs]

If she hasn't been laying for a bit a weird egg or two is normal when starting back up. 5 years is getting up there. I've had some quit laying for the most part by age 6 with an occasional egg. They can lay for longer but I don't count on them.

 

[ChickenShepherd_6116]

If she hasn't been laying for a bit a weird egg or two is normal when starting back up. 5 years is getting up there. I've had some quit laying for the most part by age 6 with an occasional egg. They can lay for longer but I don't count on them.

That makes me feel better! I thought I was doing something wrong

 

[ChickenShepherd_6116]

UPDATE: Today is day 3 of her laying an egg with a soft shell. They keep getting softer and softer each day; Yesterday, it broke in the soft nesting box because of how tender it was; today, the shell is like a sack, its not hard at all. Should I still blame her age or could something else be causing this?
She has free-choice oyster shells AND layer feed inside the coop; the rest of the feed is Starter Crumbles for my pullets that she can also eat, if she wants it.

 

[BigBlueHen53]

SInce she's just started laying again after a long break you can jump-start her calcium intake by giving her a calcium citrate +D3 tablet like Citracal or its generic equivalent, daily for 5 to 7 days. Just pop it in her beak in the evening after she goes to roost. It may look big to you but she can swallow it easily.