I'm sorry to say that it is very much likely the banana that did it. I never feed my GPs banana or other similar fruits/veggies because I personally feel the risk is too great.
I know many people do feed items like banana in moderation and everything is fine. Most of the time it is fine.
Unfortunately I have seen a few too many cases of drastic and sudden constipation caused by bananas (or some other types of foods). At the best the constipation clears up after some discomfort. At the worst it can be aggrivated by gas and cause bloat/torsion and death.
I do not blame you for what happened and you should not blame yourself. Your daughter should absolutely not feel guilty. These horrible things happen and you had no idea that a treat given with love could cause such devistation and heartbreak.
Hugs to you and your daughter. I also hope you feel better soon (from your surgery).
Regarding the amount of banana...bananas are known for their potassium content. Large amounts of potassium injected at one time will cause muscular disturbances, including heart arhythmias. I have no idea what quantity of bannana would have enough potassium to cause such an effect in a guinea pig, or whether ingestion of food-sourced potassium could cause such problems at all. I have to wonder whether potassium ingested into the gut might cause muscle spasms in the intestines that lead to acute bloating, or if perhaps it might lead directly to a heart arhythmia and cardiac arrest.
I am purely speculating on this, I am not a vet (and it's been years since my bio classes that covered cellular level potassium response).
However, that being said, I think you do need to make it very clear to her that you are the one that decides the menu, and then perhaps twice a day, you can have her deliver it to the pig. Or, you could prepare it in advance and leave it in a container in the fridge, either all at once or in several trips. Then she has the freedom to feed the pigs treats and snacks, but everyone knows they are in safe rationed proportions!
I really have never seen my daughter this broken up. It was almost comical, me slowly walking around, trying to keep them from rubbing against my incision, as both of my girls were hugging my legs and crying heartbrokenly yesterday.
My oldest daughter just keeps saying, "Mommy, this is a bad, bad day." I really appreciate everyone's well wishes and support. My biggest reason for posting was just as a warning, though most of you are much more knowledgeable than me. But I was thinking about laminating a diet sheet and keeping it near the cage should I ever be out of commission again at short notice.
- Supporting my GL Habit
I am so careful now with stuff like carrots and fruits. Much more than I was in the past. I find that its so deceptive with amounts. Look at a tiny carrot or a small wedge of apple and say - that's not much at all! Then I think how big that small wedge is to the guinea pig, and realized its probably the equivalent of me eating a few handfuls of carrots, or eating a few apples all at once! Granted - they are grazers and humans are not, but I find I have to remind myself that what appears small to me is a very large amount for them.
Adopting two new pigs would be a good way to heal, and maybe you could stress to your daughter how you are saving the new pigs and giving them a good life with you.
This is truly so sad, and it is terrible that it happened while you were having your own health problems.