Levi's impression of his sister was that she was really stupid but also really strong. Maybe her stupidity was born from the fact that she had been alone all this time and didn't understand much because of it.
The more she picked the herbs the more used to it she became and collected them the right way. Upon collecting enough they walked back to Arkadia.
"Whoa, is this your home?" She was amazed by the structure, she obviously couldn't see inside that's how tall the wall was. "You built this?"
"Well, I had help."
She was practically bouncing around him with excitement. He couldn't but think he'd just gained another Scarlet but far stronger with how childlike she was, even though Scarlet acted like an old woman at times.
'Did they maybe switch minds unknowingly?'
"Do you need me invisible?" She asked thinking she was being considerate.
"Why would I want you invisible?" Levi was confused.
