Walter once bubbled...
I don't know if it's still true, but PADI used to have an "experienced diver" program. They would issue a c-card if you could show evidence of diving experience. Producing a c-card from another agency would serve as evidence of experience. I'm not aware that other agencies have ever had similar programs. YMCA will issue a c-card to US military trained divers if they present a copy of their training record.
It's not a cash for card thing.
My first point of emphasis: This is intended for those exceptional cases where a person gains considerable scuba diving experience without having a recreational c-card. Commonly this is when an old certification card is lost and no record of the certification can be found, or a diver has military experience.
Now, to quote the manual:
The Experienced Diver
The purpose of the Experienced Diver program is to allow you to certify divers
who are not certified, but who can provide proof of scuba experience, or to
certify divers certified by training organizations other than PADI as PADI Open
Water Divers.
Course Prerequisites
Any diver with a scuba certification from a training organization
other than PADI may enroll for Experienced Diver certification. In
most instances, a continuing education course may better meet the divers needs.
OR
Any diver who has been diving for a minimum of two years and has
proof of 20 or more open water dives, and who has never taken a
scuba course, may apply for an Experienced Diver certification.
You may accept properly logged dives or military qualification as proof of
experience. Other acceptable proof of dive experience includes a statement
witnessed by a certified diver.
Use this certification
carefully and with
discretion. As the certifying instructor,
you are responsible for the divers qualification.
Procedures for the Experienced-Diver Certification
To earn the PADI Open Water Diver certification, the Experienced
Diver must satisfactorily complete the PADI Scuba Review program,
PADI Open Water Diver Course Final Exam, and Open Water Dives 1
through 4 as outlined. You may allow applicants to meet these requirements
by participating in the final phase of a regular Open Water Diver course.
done quoting now
NASE certification should be no problem. It is a widely recognized program. If she really wants a card from another agency, suggest she consider taking an additional course such as a AOW or Nitrox. The NASE OW cert should be adequate prerequisite.