I have had a fabulous relationship with my mother in law for the past 5 yrs. 

2 yrs ago she was diagnosed with secondary bone cancer.

In the last yr she has become very argumentative towards me and recently has made it quite clear she does not want me around at all.

Obviously this hurts as I don't understand where her dislike for me has come from and it is proving very hard for my husband (her son)

Is this normal ? 

My husband tells me that today at her consultant appointment the doctor identified that my mum in law seemed very confused and he thinks there is a chance the cancer has spread to her brain although we will not know for sure until tests are done.

Is the confusion and nasty spiteful episodes going to get worse and is there anything I can do to get ourid once great relationship back on  tract or is this something that is only going to get worse and what is the best way to deal with this for the sake of my husband our children and myself 

Thank you