Joy,
Did you ask her to come to the scans of your DS? If so, then by all means ask again. Otherwise, i wouldn't think it would be a great idea. It could come across as pitying and she might feel oblidged to come when she might not want to.
I think you did the right thing telling her before everyone else.

I have found that a few of my friends have really ignored me now that their bubs are born and they know about our TTC struggle. It makes it really hard after the baby is born. I feel like they don't want to ask me over for fear of offending me and things are a bit strained. It makes me feel even more like there is a club and i'm just not being allowed entry. But in saying that i do have lovely friends who treat me totally normally and that's cool.
Wishing you a H&H pregnancy.