Mediocrity Is Its Own Reward?

I work at a drug store, a drug store in which if it makes sense, it does not happen. soon, I'm not sure just how soon, though, we will become what is known as a wellness store. no big deal, right? wrong. huge ginormous deal. because with the conversion, comes a new position, wellness ambassador. sounds like something that's right up my alley, right? right. this person basically walks around the store with an iPad and answers questions people have about vitamins. definitely something i want to do since I did go to pharmacy tech school. I am the only cashier that did. this should not even be a debate as to who gets the job. but there's a huge problem.
her name is rose. shes only been at the store since December and she isn't so great at her job. she hovers by the register. if a customer asks a question about where something is, she always, without fail, takes them to it rather than just telling them. this is a huge no-no. when you're working as a cashier, you are not to leave the front area, which is cosmetics and seasonal.
a lot of the time the item is not in that front area. a lot of the time the item is a gnc item. the gnc area is right in front of the pharmacy. in the very back of the store. and when she's checking people out she has a personal conversation with every. damn. customer. no matter how long the line is. and several times a shift the second cashier aka the floor person has to bale her out. and its frustrating because a lot of the times I'm working on resetting the merchandise. and im pretty good at it, in my opinion. but well get to that.
on stock days, everyone has to show up and stock the freight. sounds simple, right? right. she's been working six months. that's about twenty four stock days. do you know how many stock days she's actually touched stock? four. maybe.
our sales run from Sunday to Saturday. This means that our sales tags need to go out on Saturday night. Well, since the beginning of the year our stock days have been on Saturday. Kinda hard to put the tags out if the stock isn't out. Well, every Saturday, I work the morning shift, putting up the cosmetics stock and working the register. Rose and another cashier come in at two and four, respectively. By two, a lot of the time, I am pretty close to done with cosmetics, which is some miracle due to Saturday being our busiest day. By three, I have left cosmetics with about three or four totes. Sometimes, with none. I go to the aisles and help the boys. Rose is to either start pulling the tags or finishing up with cosmetics. By four, when the other cashier, let's call her Y, gets there she should pretty much only be on the floor, not running the register. And by the end of the night, they should have at least SOME of the tags hung.
EVERY. FREAKING. SUNDAY. MORNING. I come in and NONE of the tags are hung. None of them. Just what are they doing? Not only that, but none of the stock is put up. AND a lot of the time, there is actually MORE stock left than there was when I leave at five. How is the whole back end of the store getting done and not the front? It makes me look lazy, and if you didn't know what's going on, you would have probably fired me by now. Anyway, you know who gets to deal with the tags not being done? Me. Every Sunday, I am handed every yellow tag for the ENTIRE store. And I hang every yellow tag in the store. What does Rose do? She hangs out by the register and does what she does best, talk.
AND SHE IS GOING TO GET REWARDED FOR THIS! My manager is planning on making HER the wellness ambassador!
It. is. not. fair. I have been working my ass off for the last year. I do everything that is asked of me in a timely manner. I have a lot of skills that most cashiers don't. I know where everything in the store is without even thinking about it. I know a lot about what products we do and don't carry. I can even tell you what a lot of our products do and the differences between the different brands. Most of the store's other crew has started referring to me as the cosmetics specialist because I'm just THAT good. I've even become pretty darn good at taking passport photos. I'm a fast cashier. The customers like me. I'm always smiling. I know my shit. Why NOT give me the job? I am being punished for being good. No, I am being punished for being great. IT. IS. NOT. FAIR!