Sorry this has happened to her baby,her, and your family. What an awful thing.
Please let her know that you are there for her - now, not tomorrow. One thing a lot of the angel moms say is that they wish people didn't avoid them or what happened. I know you don't mean to avoid her out of fear of upsetting her, but just let her know that you are there for her today. If she is angry with you because of your pregnancy, it is her grief talking and she isn't thinking with a clear mind. Better to be a target of her (temporary) grief anger than the anger she may have if she thinks nobody is there for her. And for all you know, she may just want you to give her a hug today.
Please let her know that you are there for her - now, not tomorrow. One thing a lot of the angel moms say is that they wish people didn't avoid them or what happened. I know you don't mean to avoid her out of fear of upsetting her, but just let her know that you are there for her today. If she is angry with you because of your pregnancy, it is her grief talking and she isn't thinking with a clear mind. Better to be a target of her (temporary) grief anger than the anger she may have if she thinks nobody is there for her. And for all you know, she may just want you to give her a hug today.