To be honest, ever since Rastina came to Mohe's mansion, everyone in the mansion hasn't been as casual as before.
After all, no matter what, Rastina is considered an outsider.
At that time, she didn't recognize Doro, nor was she aware of the real identities of others in the mansion.
Logically, she should know Lisidorwei, but according to Lisidorwei, the relationship between the Gold-Seeking Commerce Association and the Crimson Queen is quite distant, almost having no business connection. And during that period, most humans only knew the Crimson Queen, not Lisidorwei.
Moreover, the fact that Lisidorwei betrayed the Demon Race actually has little to do with merchants. Typically, merchants of middle to lower levels are not likely to know the details.
If Rastina indeed married a Count from a noble family, she might know about Lisidorwei's matters — she only met A·Gedora when she was a child. It's not surprising that she couldn't recognize her.
