Murial's Wedding
(1995)

Muriel enters into an arranged marriage with a South African swimmer so he can get a visa to swim for Australia in the upcoming Olympics and gets the big lavish wedding of her dreams, and the mean girls from her old town are her bridesmaids.  Rhonda, her old friend, now in a wheelchair comes to the wedding with her mother, and berates Muriel for her now selfish ways, and explains how difficult her life is now in her wheelchair with the mother taking care of her and lack of independence

In the end Muriel realised her wedding is a sham after sleeping with her husband but knowing that he will never love her, goes to collect her friend Rhonda and start a new live together 

Thanks Kristine!