"1 - What certification(s) and/or degree(s) does a person need to ultimately become a labor/Delivery nurse?
2 - Would you recommend favorite study materials and references, to PRE-Prepare her for classes and the new career!"
An ADN is an Associates Degree, which requires about 2 years of the nursing program, plus any pre-requisites and general ed classes like english and math. Pre-reqs are usually science courses like anatomy, physiology, & microbiology. Each college has their own set of pre-reqs, so it depends on what the specific requirements of the school are. It took me a few years to get my pre-reqs and general ed classes out of the way so I could get into the RN program.
The BSN is a four year program, plus the pre-reqs, and a diploma program is usually about 3 years, but it is training that is done in a hospital (not too many of those left).
The best way to get started is as Teresa suggested, to contact the nursing programs
near you and find out what is required.
You are so thoughtful to do this for your wife. I have no doubt that she will reach her goal with such a supportive husband!