How can we help Sadaf regain her trust and feel respected before her marriage in December?

asalam alikum here i want to ans about a problum related to my sister her name is sadaf .she will get married in inshAllah december . problum is that as her month of marriage is decided she is very upset . she has nightmare. she become angry .she thinks that every buddy is lying with her . she is losting her trust . she thinks that people donot respect her . kindly tell us wazeFA for that thank U