OK so nobody has bitten on this one. Well,
I found the news story interesting.
I'm becoming more inclined to believe that Isabella Ann(e) Allen of Madresfield, Worcs is a strong suspect. Familysearch finds her there in 1851, with her sister Anne and a cousin Mariane Dance (all "landed proprietor") and three servants, and this fits her baptism there in 1810 to John Henry Allen and Susanna Rebecca, who may be a Cooper who he married 1808 St Pancras, and the only siblings found were John Henry Thomas chr 1809 and James chr 1820 who cannot be found thereafter.
She is also on the 1861 there but I only found that on Ancestry which I no longer subscribe to.
Lookup please? I've not found her or her family in 1841, though I think her mother may have died that year in Upton district. She's almost certainly the one who dies 1865 Upton district aged 54.
What makes me think that this is the one is that she is of
independent means, which is quite rare. As the article says, only young women of means could afford the time to study and engage in botany. Most young women would need to find a job that involved working long hours, or find a husband.
I don't think she would have lived at Madresfield Court -
https://en.wikipedia.org/wiki/Madresfield_Court. It's true that the Lygons who owned it were in London in 1851, but it looks too big an establishment to be looked after by a mere three servants.
The article states that there are a lot of Isabella Allens on trees but I've not found this to be true, especially not with the middle initial. Someone of 19 or 20 is old enough to recieve the books as a gift in 1830. What do you think?