I've never seen cards per se, but you can simply find images online and print them out for this personal use. It also may help the forget about the complexities of an adventure and start out with a few solo encounters she can do on her own, or with one other person. Pick a few scenarios - combat, using a skill, relying an on attribute (like strength), how npc's are used, etc. and weave them into a "day in the life" adventure - nothing with complex plot, really a series of easy learning encounters. Or make a short "go fetch" adventure that incorporates all this without having to keep lots of facts, maps, and interactions straight so she can focus on learning the mechanics and getting the flavor. Maybe even tracking down and getting some biological samples from a few monsters for a wizard - the NPC can be the tracker. The NPC can be the one who gets her out of trouble if things get over her head.