poppy's got a point -- as much as I'd like to hope that she's that good, she would have had to break DoM stamps without her wand, and commandeer an owl, all without raising an alarm. and that's pretty damn hard to do.

maybe they're trying to find out who your contacts are, try and do a sweep. sounds like something they'd do, plant false information and follow the paper trail. and if they know you and her were in school, they could be using her to try and get to you. I hate to say this, but it could extend to passing false intel to bill's people -- if they're trying to find a leak, this would be a pretty tempting story.

do you think she'd be capable? did the letter sound forced? other than her seeming nervous, did anything seem off?

if they are trying to track your connections, you'd head them off by printing it yourself -- although there'd be a chance you'd get mud on your face.