Good try. Fortunately we can check the text[1] and there are no characters named "Lily".
However, there is a prior reference to lilies as a thing of beauty:
> Our beaux are terribly at a loss for similies: you have lilies of the valley for comparisons; we nothing but what with the idea of whiteness gives that of coldness too.
and it seems likely the author was referring to that theme.
Additionally this isn't the only quote from a similar timeframe:
However, there is a prior reference to lilies as a thing of beauty:
> Our beaux are terribly at a loss for similies: you have lilies of the valley for comparisons; we nothing but what with the idea of whiteness gives that of coldness too.
and it seems likely the author was referring to that theme.
Additionally this isn't the only quote from a similar timeframe:
http://itre.cis.upenn.edu/~myl/languagelog/archives/002611.h...
https://www.macquariedictionary.com.au/blog/article/94/
[1] https://digital.library.upenn.edu/women/brooke/emily/emily.h...