Relations & christmas presents ?

I had a falling out with one of my sisters in law some years ago * it was her fault not mine * Over the years I have done my best to make amends however , even though she hurt me bad I was more prepared to end the fued .I have three girls & one boy the two eldest girls are married and live a short distance from home .I have the youngest girl still living at home although she is grown up. My sister in law rarely calls in to the house but when she comes to collect her sister ( who lives with us , she is not capable of living on her own ) she phones in to her to come out and off they go for a few hours .On sunday last she came in unannounced I made the best of it .I went to visit my two married daughters on sunday evening to discover that she had brought presents for them but she had nothing for the girl still living with me which happens to be her godchild,or anything for me or her only brother my husband. I know that the girl at home is very hurt by her behaviour towards her and that she thinks so much of the other two. ,the girl at home never said or did anything to her that she should single her out ,I don't care if she never gave me anything but I cannot tolerate her behaviour towards her godchild , I told my husband what she is doing and I know he is upset but he doesn't want a repeat of the trouble she caused before.My three girls are equal in my eyes and anyone who don't treat them the same have no place in my life .I am tired of her behaviour should I just turn my back and treat her the same .Actually this woman is a religeous so much for forgiveness,I have more of it in my little finger than in her whole body .what do you think ?