My Cousin Sister Cheated Me.

my cousin sister who has bought tons of stuffs including makeup items & personal things which costs about nearly 15000 Rs. She said that she will be returning it slowly in installments. But nothing done so far, we were not like before now, even the terms with our families aren't good now. Feel like she cheated me and used me for all her needs, I've proofs that she asked to get those stuffs & for which she also paying for it later.