What is your daughter’s interest in sign language? Is she wanting to incorporate signing into her worship(wonderful idea and fun, too) or she wanting to communicate with the deaf(again, a wonderful idea and fun, too)? I ask because I have some experience with both and have taken some community college courses.
Signing a song and signing for communication with a deaf individual are different. It sounds like that book would be good for songs. Some good ones to get an introduction to ASL(American Sign Language) are : A Basic Course in American Sign Language and the Joy of Signing. Just as with any foreign language, if you can get her some exposure(be careful due to age) with a native speaker that will help as she goes along. There are also cultural things to consider, aspects of how they view their community, etc. that are different than their hearing counterparts even in the same geographic location. Also, if she studies this over the next couple of years you can count it as a foreign language for High School.
Just some thoughts, feel free to email me off-list if you have specific questions. This has been an interest of mine since I was in the 8th grade. Let’s just say that was a while ago 🙂 .
Faithfully,
Jone