Looking for occasional pet sitting when my kids are on vacation with their Dad

2 year old German Sheppard who would need to be walked and played ball with once when I am at work on Mondays and Tuesdays. She would need to be let out to go the bathroom once or twice and have her water refreshed and possibly dog food refreshed. She will be your best friend if you walk her. She is very energetic and loves to walk and play. She is socialized and goes to dog parks weekly and gets walked twice to three times daily and 20-30 tennis balls thrown daily.