Tl;dr: LTR suddenly had to work late, I think she knew beforehand and did not tell me. Dread game or confront?

So normally, I'm quite confident with shittests and handle them well, although they weren't as "big" as this one. This is why I want your view on this. Short back story: LTR for 10 months, we did not fight once as I'm very dominant and she pretty submissive. I got a few rules, and one of them is being on time, the other is not wasting my time. So if I take time to meet with her, I want her to understand that this is precious time. It worked flawlessly thus far, till today - but I'm also aware that I might be overreacting.

LTR had to work, and told me she had to serve drinks on a small work-party after regular work. Afterwards she wanted to meet me. I said cool.

She told me she'll be ready by 9pm and wanted to come over to me. Comes 9pm, she texted that she's guessing she has to stay till 11pm, but I can come over to her place when she is ready.

I wrote "No, you can come over to me. If you don't want to, we'll see us another time."

I was pretty sure when she first told me 9pm that this was bullshit.

My question is now, should I engage in the situation and confront her that I think she told bullshit? Or should I let it go unnoticed?

I was thinking about going a bit dread game, then on the other side it could be viewed as a minor shittest (it was true, she had to stay longer bla bla) and dread game would be too hard / I would seem butthurt.

Sidenote: another guy seems unlikely as she adores me over everything. But of course, awalt. Still, unlikely.

So, what do you think?

Quick Edit: work is over, she did not come over to my place. Guess I seemed too pissed.