HI! I'm Amber (aim: eckcooties) I play two death eaters currently. lol. Don't ask. No but yes. This first one is Neal Jugson - ravenclaw class of 68. He's a Healer at St. Mungos in the Dai Llewellyn Ward for creature bites by day and a healer for the DE's occasional bumps and bruises at night. He's not a KNOWN death eater so there's a chance Emmeline & Neal could have some civil conversation here and there - especially since they were in the same house. I don't think they'd be GREAT friends or anything. But he'd definitely be civil toward her if they ever crossed paths.
I also play Rabastan Lestrange (lesstrange. They were in the SAME year so they'd definitely know each other ala-classes and things. He's a bit of a trust-fund baby who currently "works" as a law-wizard in the Nott Law Firm. He's not exactly a KNOWN death eater but given his families.... reputation I'd suspect Emmeline might have an inkling about Rabastan's true leanings. I suspect given your girl's personality there's definitely some great chance at snark and unforgivable out witted grudges from the past. lol he doesn't like when women ... outsmart him. Not that it's hard to do or anything.