I would definitely be going to HR to have a chat. I would say I've got a few concerns over something thats just been bought to my attention. I'm worried that having someone fill in the position part time may jeopordise my ability to do so when I come back after maternity leave. You need to get them to understand that you're not just having a winge, you are genuinely concerned about the implications of whats happening.
Also I would just keep an eye on this co-worker of yours. It seems a little underhanded to me that she has set up this meeting for her friend and then tried to keep you on side by telling you the 'secret'. Perhaps she is trying to protect her butt from both angles, the problem is that it makes her seem like a pretty untrustworthy co-worker.
I don't think you can be faulted for discussing it with HR as long as its in a professional way. They'll understand why you're there.
Good luck hun, let us know how you go.
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