Workplace help

[shelokay]

Hi, Im hoping someone can help me here..

i started a job before xmas where we work shifts, every week we are given a rota for the next week.
i normally get put on a shift that is 2 of us and not just 1 that works.. but there is one girl who always wants to work with her friends who get pout with me and so when someone goes off or a shift needs covering she will come forward and say she will work but only if i do the 1 person shift and she can do the 2 person.. to begin with she was always texting me all the time to ask if i would change shifts and i couldnt do it.
now in the job everyone needs to be flexible and if there is a good reason for me to change shifts then fine.. but her reason is "cos i dont want to work the 1 person shift that needs covering" and my work has told me that as she is picking this up as extra then she could pick and choose what she wanted to do.
When i get my rota every week i work my life around it.. and altho the times dont change dramatically if i change my shift, just knowing that i am not as used to the 1 person shift and if a problem arises i may struggle to finish on time to pick my son up.. also im unable to collect a new rota and have to work from a text message which frankly doesnt hodl much info! it stresses me out!
no other collogue has ever asked to change shifts with me except this one girl who is now using the power of knowing the company is short staffed and they are desperate for her to pick up extra shifts to get what she wants..
i basically said today after having to have my shift changed, cos if i say no to changing it i get nagged and nagged to change cos she says she wont work unless she gets my shift, that in future i will pick up extra and demand her shift which i dont think the office liked, i dont like to resort to such petty childish behaviour but i refused to be walked all over.. we r meant to be a team and help each other out.. and i acknowledge problems arise and i am happy to help people out, but they dont need heling out 2 -3 times a sodding week by the same person!
is this bullying? cos my work says it isnt?

[shelokay]

oops looking more carefully over the forums it seems i may have had to put this in a different catergory and i apologise for my stupidity

[Forest Fire]

If you don't want to change shifts then say no. If the girl then decides she won't do the extra shift because of this then it's up to the company to sort out someone else to come in. You don't need to worry about it, and from my experience no company i've worked for has ever been gratetful for me incoviniencing myself to help them out.

[shelokay]

yh but i feel its going to look badly on me for not being flexable.. and when i did say no one evening while i was out, i was bombard with calls and texts telling me how she was picking up extra and can choose what shift she wants for this really.. im also worried its going to look bad on me :(