If she wished to investigate someone, it would be child's play. Simon had been working hard to develop his own network, trying to use the kingdom to spread his influence through the regions.
But he was painfully aware that his efforts were still in their infancy compared to a Demon Lord of her stature.
If she wanted to, she could probably know everything about him. But the real concern wasn't the fact that Lilith knew of him—many beings might eventually come to learn of him as he grew stronger.
Simon's greatest fear was whether or not she had discovered his most closely guarded secret: the Fragments of Pride. He had made sure that no one, aside from his closest subordinates, knew of its existence.
If Lilith, or anyone else of her calibre, were to find out... the consequences could be catastrophic.
Simon shook his head. No, it's unlikely. There's no way she could know about the Fragments. Not yet.