Firstly the circumstances of the other person(husband with good job, she saying she doesn't need it) are irrelevant
Secondly, people do not get made redundant, roles do, and if the company is struggling and has decided to make redundancies, they are entitled to
When a company is deciding to make redundancies, it is supposed to establish criteria for making it's decision and performance, roles, and LIFO are potentially valid criteria. I suggest you write to your employers and ask them to outline in writing the reasons why you were selected for redudancy and the criteria they used in making their decision. With that information, you may then be in a better position to make a decision as to what to do next