She looked a little uncomfortable when those two arrived that's for sure, but I think we can assume that Burke has tried it on with Bella the guy is just sleaze and she probably would rather just avoid both Stephen and Jade.
In the dinner at her place it comes out clear she is no fan of Jade and not willing to share her toughts with us. Only if the MC could be capable of telling her Jade acts Mrs. Robinson on her

I'm sure if he'd tell her Jade's flashing stuff she would be up to go a bit more open, but that is just a guess.
In my oppinion Stephen clearly tried to give Bella's dog a bone(er) but I'm mostly sure he not succeeded. If he would then why on Earth would Bella be this pent up to fall for MC out of her sexual self control? he is clearly unsatisfied for months or mostly ear or years... I tend to believe that she knows some dirty stuff about Jade. That woman is a real predator (just how I like Mrs Burke

)