If Emily is covertly mean, it would be a first in Jeph's characterizations. He's done openly hostile (Hannermom, Vespavenger), and friendly but violent (Faye the kitty cat who only knows how to scratch), but never sneaky.
I'm very much in two (or three) minds about Emily's sunscreen trick/goof. A lot depends on how you read her expression in the 4th panel of 2300, and I'm probably factoring in cultural factors that Jeph did not intend.
Someone earlier in this thread referred to Japanese tanning, and linked to the Wikipedia article on
ganguro fashion. The whole point of
ganguro, however, is that it was/is a statement of
rebellion. East Asian cultures generally deprecate tanning quite strongly, especially for women, and in China it is very common to see women of all ages covering up and carrying parasols. The use of (sometimes quite dangerous) skin-lightening treatments is also widespread. So depending on how Westernised Emily (who plainly does
not tan) is, this could definitely be a dirty trick. On the other hand, why pick on Hannelore, whom she has only met serving smoothies at CoD?