Sounds like she doesn't understand the real dangers of turning a baby to early, there are some good videos on you tube that show what happens to a bub turned to early maybe you could send her links to those.
If her seat has a turn limit of only 8kg then she needs to buy/hire a seat that rear faces until 12kg as it is illegal to turn bub before 6 mths and very dangerous.
Here is another link. Wow. I hope she's prepared for the worst to happen she has even a slight accident, doesn't even need to be a high speed impact to cause devastating damage to a baby. Sounds like she's made up her mind - if she's educated and still makes the decisions then I guess all you can do is really hope and pray she doesn't have an accident.
If it is illegal in her State you can always call the police and report it.
Rather than do it through FB, where it can turn into a power struggle rather than dealing with the actual issue, give her a call or drop in and talk about it.
Bookmarks