Although Isabella, as has been pointed out elsewhere this GR, tends to revert to some fussy ways when she's at Hartfield, in commiseration with her father, the omniscient narrator (ON) tells us in no uncertain terms that she's a very happy and fulfilled woman (chapt. 17):

"Mr. Woodhouse having, as usual, tried to persuade his daughter to stay behind with all her children, was obliged to see the whole party set off, and return to his lamentations over the destiny of poor Isabella; -- which poor Isabella, passing her life with those she doated on, full of their merits, blind to their faults, and always innocently busy, might have been a model of right feminine happiness."