feeling hurt

I had a miscarriage and found out a couple months after that my big sis was pregnant. i was so happy for her, then we had a conversation and she told me that "she thought that i would be jealous of her" but in truth i was not. i was genuinely happy for her and was excited for the presence on my niece (found out that it was a girl). i guess she was disappointed to hear this because as the months progressed she became mean and hurtful which lead me to withdraw.
we have not spoken in days and when my mom tried to explain to her that what she is saying to me is very hurtful she didn't want to hear and replied "it is time for her to get over it " that hurt even more because i am trying and thought i already got over it.
 
But no matter what i cant help but feel like a failure :(