Bi-polar?? Mental Health

My mother in law is bi-polar and is on medications but recently changed them and this past year her mother died which has been especially hard. We had a baby and she was in the delivery room and I thought that would bridge the gap and help our relationship she helped out for 2 days after and she has not been to visit in almost 7 months it is her first grandchild she does not work either. My husband calls and emails with no response or if she does it never gets brought up so I stayed out of it b/c I don%26#039;t know how to deal with her moods. Finally I wrote a email because my husband had been saying not too b/c she is fragile and he knows how to handle her and the email I wrote only said- why have you not come over and she never directly deals with why now she is blaming me for everything and I am the one that opened up real communication about things instead of all the fake phone calls continuing. I can%26#039;t keep dealing with her saying mean stuff????