indri

If Drusilla was wearing "civilian clothes", as it were, on the night that she was turned, it's more likely that she was on the eve of taking her initial vows as a nun rather than her final ones.

And just to muddy the waters even more, by the 1860's there were Anglican religious sisterhoods active in England -- a quick Google turns up The Community of St. John Baptist, assorted orders of Anglican Benedictines founded at various dates, a nursing order called the Order of St. Saviour's Priory (founded in 1855, handily enough), and others as well.