?record egg weight /chicken diarrhoea

Hi everyone,I have two Isa Warrens about 2 years old now.
The last week of hot weather has not stopped Morag the smaller hen from laying daily like a machine!
However, the larger hen Enid who lays eggs 84 to 89g(!) has had a lot of soft shell eggs, often passing them after a fright or spontaneously having jumped off her perch.Enid last passed a formed egg two days ago.What would have been today's egg passed late yesterday night.We had to remove the residual shell from her bottom.Today she appears tired, slightly withdrawn-has been eating pellets,oatmeal mash and sipping water. She has had three watery stools prior to oatmeal mash which she wolfed down.Tail is still down although she has just been outside coop to preen neck feathers.Not sure if now is the right time to take her to the vet or watch and wait and try live yoghurt.Both hens were wormed earlier in the year and the other one is charging around.Will quarantine her.Local vets hadn't seen chicken in 20 years last time I took Enid so I don't have much confidence in them . This blog is often more useful.Any advice appreciated.

Thanks. I fed Enid some watered down oatmeal and water at alternate intervals earlier today instead of yougurt. Enid perked up having dropped a squashed shell with a yolk in the nest box.I think passing such massive eggs is a real triumph but when the cycle is-pardon the pun-"broken"  then she suffers for it the next day. Her movements are still slower but she's out scratching and dustbathing again and was even tempted by some small lettuce leaves. Is it common for eggs to be 89g?I also read that during hotter weather they lose a lot of carbon dioxide in their breath and often this affects the carbonate available for shell manufacture which may fit with whats been happening to her egg shells.

My Cuckoo Maran usually lays large eggs but on three occasions I have had extra large ones - 2 at 94g and 1 at 96g - all 3 were double yolkers.  She is my most consistent layer too.

I only have four hens and one laid a massive egg yesteraday weighing 115 grammes (ouch). Not sure which bird laid it but none are big birds and all are walking OK!!!! All eggs laid today were normal size so hopefully all are in good health. An occasional large egg has been laid durin the last 6 weeks os so. Is this normal for young birds of 30 - 40 weeks?

It can happen in young birds whilst they are getting the hang of it.

115 g whats that in english/imperial with out getting my scales out

big enough to need epidural!