Don't be in a rush to progress too quickly. Changing locations to outdoor hides, different buildings etc is a lot more challenging, you don't want to frustrate a young/green dog by asking too much. You want them to continue to be successful and build their confidence, slowly increasing the difficulty of the hides.
Ideally, you will start adding some items in the same building you're training in, like some containers, then maybe add a chair or small table in between containers etc. Rome wasn't built in a day. GSD's are naturals at this kind of thing, you'll progress faster than you think if you don't skip steps. Just stick to the plan your trainer gives you.
A little tip, keep your feet moving. Some dogs start to rely on their handler's body language to tell them where the hide is.
If she's starting at your daughter taping, just give her command to search again, maybe tap the wall and get her moving to get her mind back on the job. Be proactive.
Looks like you guys are doing great so far, keep it up!