You learn something new all the time. I always thought 1 oz was 1 shot, but I've never had the "minis" so I didn't know they were 2 oz.

It certainly does sound strange, but what does it really matter? The FAs are given a rule about doubles and if she's confused and thought that constitued a double, what's the bother if she's overly afraid of getting into trouble? You still got however many drinks you wanted all throughout the flight, no?