Go to a running store and have her fitted. Most will "run test" on a treadmill to observe gate and foot pronation and then recommend the best shoe. I'm a loyal Saucony wearer but my running friends swear by Brooks. It really is an individual preference. After you've tried things on her and find the best one go online for the best deal. I can usually score deep discounts on amazon and running specific online stores. Ask the running store people if the model you all pick has changed from the previous model...and if not then look for the previous model for even deeper discount. Most running sneaker brands update the model yearly and sometimes the only change is the colorway.
Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.