I’m so very sorry for your loss 🙁
I think it’s very normal to feel guilt when we loose a beloved pet, and important to learn from our mistakes, but I don’t think you carrying her was for sure what caused her death. Fear can cause heart attacks, but usually only with prolonged fear (such as a dog barking at growling at a bunny right outside the cage). And I imagine if it was from you handling her you would have seen it happen right away, not overnight. Young bunnies can have heart defects that don’t show up right away, so it’s very possible and probably more likely that she had a congenital issue.
Of course it’s important to handle rabbits safely and gently, but please don’t beat yourself up over this.
(((Binky free little bun)))
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.