How do I cheer my friend up, she lost her baby?

My friend is 16 and she found out yesterday that she was pregnant, but had lost the baby. She sounds so depressed and I don’t know what to say to her. She said she has already had a dream about it. I feel depressed. I don’t know what to say. She said she feels kinda numb, but I think she is worse off then she is saying. How can I comfort her? Advice? Please?

She said she tried calling me yesterday, but couldn’t get through. I feel like an ass for not answering my phone.