misunderstanding
Yes, Griselda had special feelings for Olivia. She likes the same sex. She likes Olivia in another sense, not only as a friend, but also considers Olivia as his lover.
And stupidly, Olivia didn't realize it.
And if Griselda finds out about Alyosha and Olivia's meeting, it is feared that Griselda will feel disapproved and throw a tantrum. And it's even worse when Griselda comes to Alyosha and does something unnatural and excessive. This will be very troublesome later. Therefore she still chose to hide the truth from her friend.
"Speaking of which, where did you steal from?" asked Griselda. She was curious about where Olivia stole earlier. Maybe she could help Olivia after this to steal more money.
If Olivia was drinking, she would have accidentally spit the drink she was drinking into Griselda's face due to choking. Griselda's question made Olivia feel tense and nervous. She wasn't usually that nervous though.