I am trying to plate this girl i fucked last year, and invited her to dinner.

She said she can't this evening.

Asked her: but what are you doing?

She said she has dinner plans and afterwards she is kinda sleepy and it will go home to sleep.

I know what you will answer, she is going with somebody else and she might be (planning to) fuck with him.

How should I react on this? Should i bother to answer something like: "It was a rhetorical question" or better not answer at all.