Ha! I had a similar experience (to hers, not to yours) a couple of weeks ago and although I had a large and fairly competent-looking man with me, two other men (or should I say Guys) in the parking lot insisted on being knowledgeable and helpful. We *were* able to get the car started and kept the engine going throughout the rest of the errands (one person sits in car while other goes into store) and got home fine. But next time it not only wouldn't start but wouldn't take a boost.

Turns out it wasn't the battery but the starter. I guess the jumpstart was its last gasp. So next time you encounter this maybe you can get all macha and tell your victim to get the starter checked.