It's something that needs more research done but that is similar for a toad possibly. The eggs could build up in the toad and some claim that leads to problems but others never report it. Those who have toads in their 20-40's if they could share one important thing we would know the answer. We just need to know if they hibernated their toads or not. So the same question you are asking is one that nobody has shared that I have been able to find. Many others are not sure either. I will be the first active member on the forum currently to attempt an artificial hibernation and then I can report my research on both my toads and tree frogs. This could be some of the most important research I do on this forum. It may hold the key to your question as well.
Here is the thing. If the toad doesn't mate it doesn't have eggs to fertilize so what happens to her eggs if the toad doesn't hibernate does she continue to produce eggs or does she stop making eggs because if she doesn't hibernate she doesn't need them? What happens if she does hibernate and not mate does she have like you say a miscarriage? What increases the life of these toads hibernation or being active all year in captivity?
These are some of the questions I hope to try to find answers to. I wish someone had these answers and someone does out there they just either haven't joined a forum or it's something you would stumble on by luck. These questions are so important and toad keepers don't really have many answers to this is why I'm careful to give advice but I'm confident soon we will start to have some observations to form our opinions on the matter.
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