I can only speculate about it, so I'm sure that Celia is ventilating her frustrations on the MC's pic.
It's hard to say how "smart" she is considering her plot, but I'm pretty sure she's not as naive as the people put her. She probably knows that MC has something to do with her fall of disgrace, and even not considering that she likes or not, I'm pretty sure that she pretends to use him for something.
Probably she knows that she's walking in an edge of a sword with that situation, and if she acts a little afar from what's expected, then her career would be ruined as fast as she can count to three.
I doubt that sooner or later she wouldn't discover that it's the MC that is doing that, but if she'll like or not it's hard to say.