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@Hipster Girl))) I'm so glad you booked a massage for yourself! Any kind thing you can do for yourself while you naviagate this rough bit with your coworker and the company transition is great.
It sure doesn't take a whole lot to get everything in a tight bunch, let alone dealing with an underhanded goofball.
I am so sorry that she is still making this time so difficult for you. It's bad enough you're having to part with a company where you've been happy, but to add this on top of it....not cool.
Perhaps the silver lining is, like you said, you're looking forward to moving on.
This is just my .02, Hipster, but perhaps it wouldn't be the worst thing in the world if you did confront her about her shenanigans. I'm not advocating having a knock down, drag out fight, but perhaps you could think of a few key things you feel should be said to her and 'rehearse' how to say them in a concise, professional manner. That way, if the time does come where you just can't hold it in any longer, you'll have a basis for telling it like it is without flying off the handle, so to speak.
It's very interesting that your other co-worker has started making the brown nosing comments. That coworker isn't operating in a vacuum. Other people must see and hear her behaving like this. The fact that she is zeroing in on you is likely because she sees the opportunity to pick on a person who has no choice but to follow the post op restrictions or risk injury. As you said, she is not a nice person and I doubt she feels anything close to remorse for being so callous. She has no confidence in her own work ability so she must tear others down to make herself feel better. That's sad for her, but again
not your problem.
Is there someone in charge you could go to to express your concerns? Let them know that this person is making the company's transition more difficult than it needs to be and is also attempting to smear your good track record as well? It sounds like you have always been a great employee. This employee is brand new and temporary, correct?
I can't imagine your other co-workers and boss taking her side over yours.
Perhaps it's time to speak up, friend. I think a lot of people like this employee are just cowards who have a knack for bullying. When you stand up to them and tell it like it is, most of them collapse like a tower of cards.
If she thinks grinding on you about you not being able to bend down and pick up heavy boxes is a good thing, contact your surgeon's office and have them send you a statement of restrictions. You're not goldbricking, you're only doing what your OS said you should in order to avoid injury. Show the OS's statement to her and anybody else who might question the situation (sounds like it's just the problem employee).
I know it's easy for me to sit here and armchair quarterback over your tough situation, but doggone if this doesn't make me mad for you! They say silence is golden, but I don't believe that's true in all cases.
If you do let fly on her one day, just make sure your ducks are in order and you say it like it is in as calm and professional a manner as possible. It might be good to do this before you reach the absolute breaking point.
I don't know about you, but I generally take and take and take and then when I blow it is epic and not always as coherent as I want it to be.

Big *HUGS* Friend. You don't deserve this. I'm sending tons of good thoughts your way.

(Sorry for the long rant)