She's still a puppy. She may outgrow it. You've only had her a short time and its very possible she enjoys your play sessions so much, she wants more. Keep in mind this is an energetic breed so its also very possible and even likely she needs more exercise and play than 2-3 30 minute trips a day whether its playing heavily or just a walk. Also be aware that spending time training IE working her mind will also tire her out more than physical excerise. Remember school? By the end of the day you were ready for a nap after all that stuff you were supposed to be learning whereas weekends out goofing off with friends not really exercising your mind, you were not even close to being tired for bed sunday night? Its kinda like that.
Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus BCAT CAX2 CGCA ETD HCT NCO-1 PKD-T RATI RATN RA TC TKA 3/18/2013
"Hades" Guilty vom Blutfeuer 10/26/2018
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013