Re: Ideas on getting this sound?
Agree: weak pickup, old dead strings, guitar with not much sustain, small amp, and slightly out of tune.
Depending on what aspect of the sound you like, it's an open chord tuning but it's also not quite in tune. If it's the overall sound you like, you really only get that with a full hollowbody and a low output neck pickup. There is no pedal what will give you that tone. It starts with the hollow wooden box she's playing.