My mom won't talk to me

Since I confirmed my pregnancy with my mom she hasn't talked to me, she never even said anything back to me telling her I was pregnant and super excited. I will be 22 when baby is born and she was 18 when she had me so I don't understand the problem here, I am engaged and have lived on my own since 17! She's on the mainland and doesn't even live on the island I live on so its not like I'm going to be asking her for help?! I'm super confused and was feel really let down, has any one else experienced anything similar ? How did you cope ?