One of Apollo's teenaged female worshipers reveals herself as a shipper at the Pythian Games:
"I totally ship you and her since I saw that play. Team Thalia!" she pumped her fist in the air. Several girls in the audience and some on stage clapped and cheered, while a few yelled out 'Team Calliope!', 'Team Terpsichore!', 'Team Dionysus!'…you get the picture.
In The Lizzie Bennet Diaries, Gigi and Fitz both ship Lizzie/Darcy. To the point where they collaborate using Spy Speak on a plan that culminates in Gigi dragging her brother into the room Lizzie's in, pushing them both into chairs, and running out again. Maria Lu also shipped them, but to a lesser extent — she just saw it as possibility and wished it might happen.
In Worm, Lisa encourages Taylor to get together with Brian. This is partly because she's a caring girl who wants her True Companions to be happy, and partly because she's trying to ward off Taylor's suicidal tendencies by any means possible.