Here's one to check out in 1891 - surname is wrong but I can't find a birth for this name
Martha E Darke 16 born Birlingham Worcestershire
Unfortunately she is a "penitent" House of Mercy Bussage Glos
Darke/Locke might be misconstrued - she says hopefully
I often find names and ages are misread and therefore, recorded incorrectly on search database. That's interesting you found that. May I ask where you found that, so that I may look myself?

EDIT: I found it! It does seem to say Darke. However, it does mention that 'of the penitents, little reliable information can be obtained'.
IF that is her, it's likely she wasn't honest about her name.