Considering how smart she actually is, I wouldn't be surprised one bit if she knew everything about what is going on.
She could have her own camera system hidden around the house, you know.
She is incredibly smart, probably knows a lot about human psychology, behavior and biology and she is definitely able to rationalize human behavior. She wouldn't be too emotional about it, as long as the MC behaves and doesn't hurt anyone in her family intentionally. She's the kind who wouldn't mind sharing MC with her family members, possibly even with Wilfred

.
She's the least likely person to go ballistic because of her own emotions. She's clearly even more rational than Cordia.