Stroller aside, I would recommend having your friend take her daughter on some longish walks, partly because we dealt with my four-year-old niece last year, and some of the lines alone test endurance, IMHO. It's the little person equivalent of me getting up and deciding to run a marathon. Getting her used to walking a little farther, and standing a bit longer will probably be a help for your friend's stress level too. With our niece, we just took the dog for a walk and had her pick a new (longer) path every day, gave her a map of the park to look at in advance (I had some of the custom ones made for her), and she did a great job--one day she even decided to forgo the stroller completely (ok it was a 1/2 day at the AK, but I'm giving her credit for it anyway

). I wouldn't worry about other people's thinking (we dealt with a stroller, a disability, and a wheelchair simultaneously), but she does need to closely monitor her child's endurance, because what we affectionately call "The Dumbo Meltdown"

isn't magical in any way, shape, or form.