I have been giving a plate the silent treatment for a couple of days now after she was being a bit short with me and just overall having bad attitude.

I remember saying "oh we should do this specific thing in the summer together" jokingly but half serious and she made a joke agreeing. Yesterday on my snapchat I put on my story asking if anyone was up for it. she replied to it with a disappointed face emoji which I ignored. Today I put another one up being more specific about it asking whos up for it and she sent me a snapchat of her pets playing a couple of minutes after. It seems like she's wanting attention but im unsure of what this behavior means and how I should react, so far I've just continued to ignore her. We were supposed to be doing something today but I cant anymore, I mean I could but I really cant be assed especially with the attitude she was giving me a few days prior just after I arranged in advance to do something