In general, most certification programs are not looked upon with great regard by a lot of people (or maybe that's just me and those I know lol). My coach doesn't have a single certification however she has been praised by international competitors and clinicians on her ability to coach and has multiple students, most of them Adult Amateurs, riding successfully at the FEI levels.
The only benefit of a certification program for someone just starting out is that your name will be listed and searchable on the certifiers website and they'll at least have something to advertise when looking for clients.
The best thing that anyone can do who wants to slog through the tough life that is being a trainer or instructor or coach is to find a coach with an existing business, put on your big girl panties and go work your butt off working 16 hour days learning the "how-tos" of the business and of horses. Most trainers who are now successful spent years upon years upon years under high level, well respected trainers and coaches, and are still receiving regular coaching themselves. You never stop learning, and there will always be a horse or student who absolutely stumps you, so having YOUR coach to help you is the biggest asset you can have.
Find a good coach who will take her on as a working student, she will soon figure out if it's really the life for her.
They say money doesn't buy happiness -- well happiness doesn't buy horses!