We also need to think ahead to other children she might have. We don't know the impact that we are having on how she will parent future children. A young woman I've known for several years bottle-fed her first child and was an outspoken proponent of this approach. We never discussed breastfeeding. I received an email from her a few weeks ago asking for information about breastfeeding.
Mothers are the experts on caring for their babies.
If that is to become something besides a catchy motto, we must empower them to really choose, even when we don't agree with their choices. If we antagonize a mother, we lose our opportunity to influence her. Once we have given ourselves permission to be human and have issues that we are not dispassionate about, we can refer a mother elsewhere. We can also do this when we don't have a great deal of information about a topic. Give yourself permission to not have all the answers but instead offer to find out.