HP Lovecraft's anecdote about the woman who edited Dracula

I've read vague references to an anecdote which HP Lovecraft told, probably in one of his 100,000 letters, concerning a woman of his acquaintance who claimed to have assisted Bram Stoker in editing his 1897 novel, Dracula. The woman asserted the novel had been something of a mess, and she essentially helped Stoker whip it into shape for publication.



Does anyone know the source of this anecdote, and if it is one of Lovecraft's letters, which one -- and is there an on-line transcript of it?



Thanks!

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