I would say giving the lady you want to see the providers handle (how it is spelled on here) Also give around the time you seen her and something that may jog her memory to remember you. Also email address and cell number you use to call (if you do). Giving out the providers number may work to BUT be sure she actually list her number on her showcase, as she may not want that number handed out.
Hope that helps
Also shooting the other lady a PM or email and letting her know you are needing a vouch. That may help speed things along too.