which is very-very weird,because- she never calls me!这是一句什么句型?which在这里是什么意思?

题目

which is very-very weird,because- she never calls me!这是一句什么句型?which在这里是什么意思?
整个一句是：Finally,I figure I'd better answer it,and it turns out it's my mother,which is very-very weird,because- she never calls me!还是不太懂，能更进一步说明吗？

答案

后来我还是认为该接一下电话.发现竟是我妈打来的,可真是奇怪,因为她从来不给我打电话.
这是个定语从句,which指代it turns out it's my mother这句话.