Diana is a deus ex machina, they used her a lot at the very beginning but for a show called Grimm, this wouldn't last as we have seen. Most of her powers were shown when she was killing or doing bad things. The one and only good thing she did that also showed the extent of her abilities was when she changed Nick back into himself after getting stuck as Renard. Since then, she's been nerfed for story purposes. Reading symbols, knowing about the hole in the mirror and sensing Zerstörer, seeing Kelly and Marie and retaining her memory without effort didn't seem extraordinary even if she was the one able to do it.
I think Diana, as a force for good will restrict using her abilities beyond what's necessary. Adalind wants her to use her abilities responsibly so we won't see her doing super extraordinary feats because that will raise too much unnecessary attention.
I think Diana, as a force for good will restrict using her abilities beyond what's necessary. Adalind wants her to use her abilities responsibly so we won't see her doing super extraordinary feats because that will raise too much unnecessary attention.