She knew she had the condition and avoided high caffeine drinks.
She did not know about the caffeine content, 390mg in the large lemonade, due to poor labeling by Panera. This one drink is 10mg less than the maximum daily dose for HEALTHY person according to the FDA.
Given the lack of consuming any other caffeine products regularly due to her knowing about their impact on her heart, it is not a leap to say the lemonade was the culprit.
Further, the lawsuit alleges harm, even if not the sole cause of death, from their product due to not making it clear to the buyer that contents has so much caffeine.
According to coffeechemistry.com, one liquid ounce of espresso can have anywhere between 30 and 50mg of caffeine. That means that a double shot will likely have anywhere between 60 and 100mg.
She bought a lemonade, without caffeine labeling, that contained 8 shots of espresso in caffeine. Cause of death or not, the legal culpability and reasonable expectation that this would not be in its contents is clear as day.