A larger phenomenon may be at work here. Women, long excluded from American public life, have largely been neglected in American history.
Think how few female figures in American history were not (at least first) the wives of famous men. In early America a woman was expected to be silent in church and all other public spaces. Her proper realm was private; if she held public power she was seen as a threat to society. Women who challenged this established order were hanged as witches or banished as heretics. This, too, may explain why Abigail May Alcott’s writings have so long been hiding in plain sight -- a few in attic trunks and rural farmhouses, but most of them in university and archival collections.