mary in dress i saw at fidm
I FOUND THE SOURCE OF THE SYBIL/BRANSON STANS FREAKING OUT

http://www.scotsman.com/lifestyle/tv-and-radio/downton-heads-north-in-reminder-of-scotland-s-fashionable-holidaying-past-1-2681342

Specifically this paragraph:

"Forthright and determined, it doesn’t take Edna long to set her sights on the estate’s land agent Tom Branson, who’s stayed behind at Downton with young daughter Sybil. The former chauffeur was left a widower when Lady Sybil died in childbirth and despite the family’s attempts to integrate him into their world, he continues to live between the Crawleys and the servants below stairs. “Branson gives her hope,” says Buring. “It shows people a way beyond the station they’re born into.”"

But even if Edna is into Branson that doesn't mean he'd reciprocate.

I look forward to S/B stans hating her for daring to be attracted to Branson though. Don't disappoint, fandom!