Is it worth continuing to be friends?

Someone I worked with and was good friends with, has recently behaved in a way that has made me question our friendship. She has been very rude about colleagues and has put me in a professionally difficult position on more than one occasion. She has said some careless things that have upset me. I am not sure if they were meant to be upsetting or if she has just been thoughtless. She is now on holiday with a mutual friend and she has been texting me saying what a great time they are having and 'wish you were here' . It seems a little contrived and as if she is trying to make me feel jealous. She hasn't once asked how I am even though I recently confided in her some news about my health. I am irritated by what seems to be her childish behaviour and am wondering if I should bother keeping in touch with her as we wont be working together after the summer. Ditch her as a friend or forget her behaviour? If I ditch her, how do I do it?