Guardianship over a woman’s marriage and wealth
Question

                We know that if a woman wants to get married, she has to have a wali (guardian) who will do the marriage contract on her behalf. But how does she decide who will be her wali? Does the wali have to take care of all the woman’s dealings? Please advise us, may Allaah reward you with good.
Praise be to Allah.The ways in which a man may be appointed as a woman's wali for marriage 
          are five: being her owner (if she is a slave); being related to her; 
          being her patron (as when one tribe is patron of another, etc.); being 
          a leader (of the community, etc.); and guardianship (wisaayah).  
          The wali is one of the conditions of the validity of a marriage. It 
          is not permissible for a woman to be a wali in marriage either for herself 
          or for someone else for any reason; she cannot act as a wali for herself, 
          on behalf of another or as the deputy of another. If she does that, 
          the marriage contract is invalid.  
A woman who is adult, of sound mind and sensible has the right to manage her 
          own money and to dispose of it however she wishes, whether that is in 
          return for something or not, such as buying and selling, renting, lending, 
          giving in charity or giving gifts, giving all or part of the money. 
          No one has the right to stop her doing that, and she does not need anyone’s 
          permission, whether she is virgin who has a father, or does nit have 
          a father, or is married with a husband.  
It is permissible for a mother to dispose of her children’s wealth, food or 
          otherwise, as is also permissible for the father. It is also permissible 
          for a woman to dispose of and eat from her parents’ wealth with regard 
          to things that are permissible for her.  
The mother has the right to guardianship over the wealth of her children who 
          are still young or who are insane, because she is more compassionate 
          towards her child than anyone else.  
A woman does not have the right to dispose of her husband’s wealth or give any 
          of it in charity without his permission, whether that permission is 
          explicit or is implied by custom and habit.  
It is permissible for a woman to have the position of guardianship (wasiyah) 
          over someone else’s money and she may be in control of money over which 
          she has been appointed guardian, so long as she meets the conditions 
          of guardianship, whether she is the mother of the children or is not 
          related to them.  
It is permissible for a woman 
          to be in charge of a waqf; she has the right to be the guardian in charge 
          of a waqf and to decide how it should be disposed of. This is according 
          to scholarly consensus.