I think offering your experiences (asking "would you like to know what I did" rather than just giving your opinion itms) is a good thing and also encouraging your friend to research her choices. I had some very specific ideas about how I would do things during pregnancy, birth and raising my child and that has all completely changed before I've even given birth. I didn't think I'd worry so much about what I "should or shouldn't" eat while pregnant, I thought I'd be all for every drug possible during labour and would happily elect for a c section, I planned to have baby in their own room, use CIO and other methods that are certainly not considered gentle parenting. After spending a lot of time reading and hearing other people's experiences (not their opinions on what I should do, just what they did) I have definitely changed my mind about a lot of things because I see the benefits of doing things differently. Had I not researched, I wouldn't have realised how beneficial it was for a babies development to be in the same room as Mum and Dad in those first 6-12 months, not to mention the lowered SIDS risk for example.

Researching her decisions may not change anything and she may still stick with her plans, but at least then she is making informed decisions and I think that's really all you can ask from someone.