Despite the silly title this is a serious rules question: a Landed Noble clearly has the Landed Noble virtue, but what Social Status virtue should his wife have? I would go for Landed Noble but that requires Oath of Fealty and Knight - do they still apply? Is the answer in Lords of Men? I don't have my copy to hand!
The combo of virtues makes her not have an official status separated from her husband, but have important influence none the less and resources at her disposal. I guess these 2-5 virtue points would qualify as a nice package for a ranking woman.
Landed Noble does not require Knight, it is only compatible with it... meaning you can take both the Landed Noble and Knight virtues together if you wish. A woman could take Landed Noble, if she held land in her own right, perhaps as a widow. However if her husband holds the land in his right then I agree Gentlewoman is the right status for the lady of the household.
We have a female noble in my saga who has the Landed Noble virtue because her (NPC) husband is away at court so often that she is effectively the ruler of the estate. For simplicity, we wrote him up as a grog with the Knight virtue.
This is not exactly the same, but Lords of Men includes a new new free Virtue, Paid Rights, for female characters that are to be played as true Landed Nobles. The section (pages 27-29) also discusses the role of noble women and some other ways in which they can get hold of power usually reserved to men...
As for Temporal Influence, it really depends; some powerful wives had their husbands wrapped around their little finger, others had far less influence than the least of the husband's vassals.
As for the "Wealth" virtue, keep in mind that it really represents how much free time a character has more than how lavish the character's life is; the latter is more a function of the character's social status. A noble can be Poor (for a noble), and ordinary craftman can be Wealthy (for a craftman). Thus, the wife of a Wealthy, but miserly noble who insists she should take care of a lot of household chores herself would be Poor, even though she probably has servants and jewels and stuff. The doted wife of an average, or even Poor craftsman who grants her every wish (within reason) and keeps her pampered and attended by servants could easily be Wealthy, even though she does not have much in the way of material wealth.