Is it safe to give my best friend chocolate with her irregular heartbeat?

My best friend is very obese and she has recently been found to have an irregular heart beat, by her doctor. I had told her before we knew of this, that I’d give her an Easter egg. Is it wiser not to, or to give her something else instead, that she can use but not eat?

Is it safe to give my best friend chocolate with her irregular heartbeat?
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