I'm not a Podiatrist, but I'm fairly certain that baby shoes should NOT have to be broken-in!! The last thing a new toddler needs is difficult shoes to manage. Get rid of them immediately. She was probably not measured well. The previous poster suggested taking them back for a different pair, and that sounds like good advice. Ask for a seasoned salesperson to measure her.
Unfortunately, I found that Stride Rites just didn't fit my daughter's feet well. Her foot was not only very wide, but also very thick and padded (from bottom of foot to top of foot). I found a wonderful brand of shoe at Von Maur called "Geox." They are extraordinary shoes that fit her foot so well! They are quite expensive, but I thought she should spend her first walking/running summer in shoes that fit. She's now 3 and her foot shape has changed and thinned. Thankfully, I can now buy her shoes at Target.