stopping a chicken laying

out of curiosity you say the eggs are not normal - what is wrong with them?

how old is she? and also what breed?

if she is a pure bred light sussex then she could still lay for many years to come however with her history of internal laying you could ask your vet about the implants - they may have to contact the battery hen welfare trust about these.
If she is a hybrid that simply looks like a light sussex then she could be coming towards the end of her egg laying - egg laying hybrids are simply bred to lay practically every day for a couple of years and then after that they will have used up most of their egg supply and their muscles will be weaker which can cause problems with laying and also prolapses. The farmer doesn't care because they cant sell the odd shaped and wrinkled eggs and so they get rid of the birds at around 72 weeks.
I well remember the wrinkled eggs from when I was a kid - in those days shops and customers didn't mind if their eggs, fruit and veg were odd shapes and sizes because that's how they grew.

I would call your vets and ask them if this egg laying will stop (personally I think her coming back into lay was just sheer coincidence) and also see if she can get one of those inplants