I've never regarded the Bennets as poor though five daughters must've stretched Mr Bennet's 2 thousand pounds somewhat! So economies would surely be made. I think it's possible the girls shared round their clothes and hats. Although Mrs B. supposedly taught her girls no housekeeping, possibly they engaged in some light household work. And yes, the horses were used as both carriage horses and for farmwork. In Ch.7 I notice Mr Bennet asks Lizzy "is this a hint to me Lizzy to send for the horses?" To me, this implies there is no horse in the stable for Lizzy. It has interested me how Jane is the horsewoman while Lizzy who prefers to walk. Lizzy is clearly an outdoorsy,energetic sort of girl who enjoys to ramble yet I wonder why she was no horsewoman ?