<human>: Could you distill the essence of the text into 1-3 sentences?

I work at a preschool, and right now my director is absolutely desperate to find new employees because we are so understaffed that we have trouble keeping the legal student:teacher ratio. 

I started working there 3 months ago and have had no problem working the 9:30-6:30 closing shift. While it's not ideal and I don't want to continue working this shift for many reasons (I often have to work past 6:30 waiting on late parents, I have to clean up multiple classrooms to close, it's difficult to make appointments because everything closes at 5pm, among other personal reasons), I understood when I took the job that the newbie takes the shitty closing shift and never complained. I was told that once we hired someone new in my pod (different age groups have different pods of classrooms), I would get moved to 8am-5pm and have been looking forward to that.

My school just hired a new teacher, and I was informed by another teacher that she said she'd only take the job if she would be able to work 8am-5pm. The hours that I was supposed to get because I have seniority over her. I want to be understanding because I don't know what she has going on and because I know my school *really* needs another teacher, but I feel disrespected and taken advantage of because even though I have the seniority, I'm still stuck with the shitty, inconvenient shift. 

Do I have a right to say something to my boss tomorrow morning or should I be a "team player"?
<bot>: New employee got the schedule I was supposed to get with seniority; should I say something to my boss, even though I know that my school is desperate for new employees?