<human>: Okay so this isn't a new issue, it's been going on for the last 6 months at least. 

We work in a small phone based customer service team  (7 of us), taking calls and doing general administration tasks. Our calls are generally straight forward and don't last more than a couple of minutes. 

I've been in this job for about 18 months and an the most senior member of the team  (with the exception of my team leader). The woman in question, 8 months. We have a program that monitors in real time what other members are doing like if they are ready to take calls or if they are not  (an option usually reserved for toilet breaks or if you have work that needs doing)

The problem is, this woman spends a lot of time on the 'not ready' option and will go on it after every single call without fail then proceed to sit there for 3-4 minutes (all while our queues are busy). I could understand of she had stuff to do but she does it after every call and has no more work than any of my other colleagues who manage their time properly. 

It's especially annoying when you work hard and take call after call all the while watching this girl screw around and waste time. She is also 5-10 minutes late back from most breaks and late most mornings. 

My manager is incapable of seeing bad in people and, i think, is a little scared of confrontation. Numerous times I've bought this to her attention and all she does is thank me for it without doing anything. Her manager is also someone we work with sometimes and I'm wondering if i should go straight to him with a complaint about it. 

She just doesn't pull her weight and it means we all have to work harder. How should o confront this?

Can you summarize the given text in a few sentences?
<bot>: colleague doesn't pull her weight and manager doesn't seem to care. Should i go to senior manager with complaint? How do i do this without painting a target on my own head?