the church licvk is the carter scratch,there is avery good dvd homespumn tapes mike seeger with jeanette carter with booklet,
the thing is I bet Maybelle would have used more open tunings if she was starting today,from spanish tuning dgdgbd,it is so easy to go to other banjo tunings like sawmill and double c which is effectively [orkney tuning]cgcgcd,from spanish you can also go easily to dgdgbflat d,and it is much easier than standard,although i like to play carter stuff in standard too.
desert dancer is a banjo player,so she must be used to these tunings.
with a flatpick,you can strum two adjacent strings like fiddle double stop,plus you can do the equivalent of banjo drop thumbing on an up pick after the melody,on the string imediately above or below it
if you are in standard tuning this works easily in the key of c,on leaving of liverpool and wild wood flower.
of course you can finger pick doing banjo drop thumbing with two adjacent fingers,index middle or middle ring ,on an up