Margaret found a place as nursery governess and felt rich with her small salary. As she said, she was 'fond of luxury,' and her chief trouble was poverty. She found it harder to bear than the others because she could remember a time when home was beautiful, life full of ease and pleasure, and want of any kind unknown. She tried not to be envious or discontented, but it was very natural that the young girl should long for pretty things, gay friends, accomplishments, and a happy life. At the Kings' she daily saw all she wanted, for the children's older sisters were just out, and Meg caught frequent glimpses of dainty ball dresses and bouquets, heard lively gossip about theaters, concerts, sleighing parties, and merrymakings of all kinds, and saw money lavished on trifles which would have been so precious to her. Poor Meg seldom complained, but a sense of injustice made her feel bitter toward everyone sometimes, for she had not yet learned to know how rich she was in the blessings which alone can make life happy. (4.24)
The reason Meg has more trouble adjusting to poverty is that she has something to contrast it with. Both her childhood memories of a time that her family had more money and her present experience as a governess remind her just how easy life can be if you've got the cash to make it that way. Her sisters don't have the same experience, but Meg knows exactly what she's missing.