PLEASE HELP!!! My Friend is getting on my nerves!! HELP!! PLZZ?

ok so heres the story : me and my friend have been friends for about 2 years and i like being her friend but now she is getting on my nerves. i guess its my fault cuz i"ve havent been in the greatest mood but im not sure if its really my fault. shes really nosy, like ill be talking to one of my friends and she tries to but in and starts asking "what?where?who?when??" and last time me and my friend had a sleepover without her cuz she couldnt go and she even said it was okay, but then the next day we were telling her about it and she was laughing and joking around until we said something and she put on this pout and said, "ohhhh i wish i was there" which mad me a little mad,. my question is wat should i do? and is it my fault?