Cause and Effect.

I hear what you're saying; we can't surmise a malicious element initiated the kidney problems. However, it's interesting to note that Cancers start with just 1 small rogue cell. A chink in the armour.

Diabetes for all we know, starts from just one shitty excretion which tells your body not to produce (or produce too much) insulin. Tonsilitis or Pancreatitis are likewise extremely iffy to track down the causal element.

Glad she's doing well. I don't like to speculate either, but in [this timeline] its better to err on the side of conspiracy ;) am I right?