Just give her time. Infertility can make people go to dark places. She will be happy for you eventually, because as you probably know yourself, another pregnancy announcement doesn't mean that you aren't genuinely happy for someone else. It just reminds you of what you are trying so hard (and failing) to achieve yourself.
She will come around if you give her some space. This is a very happy time for you and your partner, so don't let this affect that. It's probably just an extremely hard time for her. It won't last forever, it's probably just going to sting her for awhile.