Og:
I hope you’ll permit a lurker to contribute to this conversation. This is a subject close to my heart. I do not believe in child baptism. As someone else already mentioned, Jesus himself wasn’t baptized until he was 30 years old, even though demonstrating a very strong faith much earlier (as evidenced by his conduct at the temple when he was 12). There might be the occasional exception to the rule – a very serious-minded kid who really knows what he/she wants - but generally it’s more the case of being pressured, either by parents or friends.We’re taught at the KH that once a kid reaches the “age of accountability” (and when that may be “only Jehovah knows”!), she is responsible for her actions whether baptized or not. So much for riding in on Mom or Dad’s coattails! Plus, I think it is too often the case, if they were really honest with themselves, that kids get baptized because their friends are getting baptized.
However, you’re kind of between a rock and a hard place because any resistance by you would probably be interpreted as “opposition to the Truth”, making her feel all the more obligated to follow through as a demonstration of her loyalty to Jehovah.
As several others have suggested, all you can really do is talk to her (and her mother) about it. Let them know your concerns have more to do with her welfare, and potential for making mistakes due to her youthfulness, and how proud you are of her for being such a good-hearted, spiritual-minded person.
Good luck!