in the book
Written by Nikki N
(9/18/2013 5:31 a.m.)
in consequence of the missive, Mr Morland's income..., penned by Mandy N
There's nothing in the book that Catherine's 3000 pounds comes from anywhere else -- I think it's quite clear it comes for her father -- chap 31
"The influence of the viscount and viscountess in their brother’s behalf was assisted by that right understanding of Mr. Morland’s circumstances which, as soon as the general would allow himself to be informed, they were qualified to give. It taught him that he had been scarcely more misled by Thorpe’s first boast of the family wealth than by his subsequent malicious overthrow of it; that in no sense of the word were they necessitous or poor, and that Catherine would have three thousand pounds."
The "right understanding of Mr Morland's circumstances" was that Catherine would have 3000 pounds, I take to mean that he would give his daughter 3000 pounds.