what should i do??

So one of my really good friends's bday is today, and a few weeks ago i ask her what shes gonna do for her bday and her bday comes around(today) and i asked her this morning like oh what are you gonna do? And she was like oh just a hangout with a few friends(i was still expecting an invite) and i was like oh nice! And then i see snapchat stories of her in a party bus with her friends?!? Like a party bus is something that you book in advance! Like you cant just be like oh i think im gonna book a party bus in like 30 minutes time! And im like highkey pissed bc i thought we were really good friends, like i posted stuff on instagram and everything🙄 i think i might "forget" to send a snapchat streak, bc i hate being lied too. Like okay if you dont want me to go on the party bus, fine, but DONT lie to me saying that you "dont know what you are going to do". I dont know how to talk to her anymore. What should i do?