Tracing a woman through the records
The record thins at exactly the point the name changes — and that is not coincidence.

The vanishing act
A woman who appears in a parish register as Mary Fletcher in 1843, giving birth to a child in 1868, and dying as Mary Howarth in 1891, has left three clear entries and one invisible gap. The birth record names her parents; the death record names her husband. Between them, somewhere, is a marriage record that joins the two names — but only if the searcher already suspects it exists and knows what both names are.
This is the structural problem. Every system that records a married woman under her husband's surname and her unmarried life under her father's requires the researcher to already possess the answer they are looking for. The marriage record is the bridge, but you need to be standing on both banks before you can see it.

The difficulty compounds across generations. A woman's mother underwent the same substitution, and her grandmother before that. Each generation adds another name to locate and another marriage to find. The paper trail does not break — it branches invisibly, each branch indexed under a male surname the woman herself may never have used before the day she signed the register.
Ecclesiastical and civil records approached the problem differently without solving it. English parish registers before 1754 were often inconsistent about recording a bride's surname at all; Hardwicke's Marriage Act of that year imposed more rigorous practice but did not change what the columns asked for. When civil registration began in England and Wales in 1837, the General Register Office issued a form that recorded a woman's name at marriage — her birth surname — but subsequent census entries and most administrative documents thereafter listed her only as wife of, or widow of, the man she had married. Scotland's system, which registered marriages with somewhat fuller detail from 1855, made the same fundamental trade-off.

The record does not thin because women were overlooked. It thins because the naming convention was a transfer: one surname replaced another, and the transfer point is the only place both names appear together. Miss that document and the chain breaks. Finding it depends on knowing which register, which district, which year — and often on knowing the husband's name first, which is precisely the information the wife's records do not supply.
Genealogists describe this as a collateral search: locating a person through someone else's record. It is accurate as a method and quietly telling as a metaphor.