When you say you think she is hiding something, what are your suspicions?
Having had friends fall pregnant 'first time round blah blah' whilst I was TTC (14 months including fertility treatment) I naturally felt a little jealous of them, but at the end of the day, I loved these friends and was genuinly joyful for thier blessing and overcame this jealousy, remembering that my time would come.
The decision to selflessly love you and your child despite her own circumstances is hers, and the outcome will determine what kind of freind she is.