They do count crossovers. There's some leeway for situations like, say, HDM, where a ton of fusion fic for other fandoms gets tagged with the fandom tag for HDM, but I think the mods have said they will no longer consider evidence posts for fandoms that are over 1,100 qualifying works between AO3 and ff.net.
Agent Carter has 2721 Yuletide-qualifying works on AO3 alone, so I don't think the Yuletide mods would consider that.
For what it's worth, Peggy/Angie is in under MCU for Femslashex, along with a bunch of other Agent Carter ships!
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Re: Yuletide
Date: 2018-08-08 07:42 pm (UTC)Agent Carter has 2721 Yuletide-qualifying works on AO3 alone, so I don't think the Yuletide mods would consider that.
For what it's worth, Peggy/Angie is in under MCU for Femslashex, along with a bunch of other Agent Carter ships!