 At the very least, there needs to be witnesses who can say, or at least a witness who can say, yes, I saw Teresa baptized. Here's how it was done. It was done in a swimming pool or a stream or in the ocean or a lake or something like that. As long as there's somebody who can verify that it did happen that way, the church will presume it's valid. Now, better yet would be if you had a certificate of baptism the way they would give in a Lutheran church, for example, or a Presbyterian church.