I work in a nursery, as a nursery officer, but as part of my extra duties by choice i am one of two event co-ordinators, we organize charity events, fund raisers, and work things.
Last year the other event co-ordinator decided she did not want to after having to deal with angry colleagues who felt she did not share out the money fairly after a fundraising event. This event i didn't take part in, she took over barely consulted me she tells me she did ask me a few questions to begin with but when i didn't reply straight away (due to being short staffed, and having a challenging group of children) she just took over, and refused any help. Ok fine if thats what she wants to do.
So now she pulls me aside, is upset with all the angry words said and says she doesn't want to do it anymore, ok fine i take the lead, i have planned everything by myself for the past year or so, so i begin to get stuff ignored for this years fundraiser, she keeps giving me funny looks (jealous maybe, i don't know) she pulls me aside and tells me she wants to help, she actually said if she can't help, she'll kill me 
Ok so i let her help, tell her you can sort out the poster, oh no thats not enough she wants to take over, she wants to lead the event 
I told her i am more than happy for her to help but this year i want to put my stamp on it, i asked if she could show me the letter she used but she never got round to it, so i wrote my own then felt put out because i didn't use hers, so i mixed the two together, i put only my name at the bottom, she wanted hers to, so added her, and then she wanted hers first, i said no. I want to receive the letters, i know it sounds silly, but i like the fun-ness of not knowing what free stuff we might get e.t.c But she wants that to, because she did it last year people know her name and may respond better to her (this maybe true, but hey ho, i am not changing it).
So aibu to be annoyed at her?