Final answer:
Elizabeth's concerns in her letter to Victor are about financial stability and independence, as well as the uncertainty she faces due to changes in her domestic life after her brother's marriage.
Step-by-step explanation:
Elizabeth, in her letter to Victor, expresses a deep concern about their financial stability and the uncertainty of her future after William's marriage. Her worries revolve around the fear of destitution and the need for financial independence to ensure peace of mind and the ability to live comfortably. Moreover, she desires to have some provision in place that is secure from the unpredictability of life events, be they related to her own circumstances or those of her brothers. Elizabeth is desperately seeking a sense of security in a time when her place in her brother's home is about to change, and where a single woman's status could lead to a precarious living situation.