OP, maybe bring up some of these points to your friend.
It's all good and well to say she will look after the baby in her own, but the reality is that she could have to do a 50/50 type arrangement. It happens.
For me, I don't think I could stay friends with someone that was that deceitful. If she's willing to dupe someone into having a baby, then I'd wonder if we were morally compatible at all. I just find the whole thing really disgusting.