Hello everyone. I am posting my problem in a few places because I truly want some opinions on my current situation. 

 I work with a girl, calling her, "Cat" for privacy purposes.  We both work Front Desk at a doctor's office. This means we are in close proximity to each other all day, every week day.   I don't like Cat.   Cat is a "you only live once" type who spends all her money on partying, she is extremely insecure, she asks THE SAME DARN QUESTIONS NEARLY EVERYDAY... she is just not UNDERSTANDING how to do so many things at the job and she has almost been there for two months by now.  However, management at my job is a joke and they never fire anyone and they tend to coddle the weak staff members rather than fixing them/firing bad employees.   Management says that she "just needs time" and today one of my managers came in early to tell me that I really need to be more nice and caring to Cat because apparently when I was not there yesterday, Cat went to this female manager and told her that I am cold to her.     I am VERY frustrated because though I don't like Cat at all.. I have ALWAYS been civil with her.  If she says hello, I say hello back. If she says, how are you? I say "good, thanks"  and that is all.  There is another woman that works front desk with me who I quite enjoy and we tend to get along very well.. so when she asks me how I am, I tend to expand and we have a lot more in-depth conversations because I LIKE her unlike Cat.    Anyway.. I feel very annoyed at my management for telling me to "get along" with Cat even though I have been completely CIVIL with her all along.  Just because I don't want to be friends with Cat, this means I need to be talked to?  If I am coming to work to do my job (and doing a darn good job at it.. I might add) then why do I need to be friends with a coworker? Shouldn't civility be enough?     Also.. I am annoyed because management didn't bother to ASK ME why I don't care for Cat even though they tell me so often that I am loved around there and that I have done so much to improve the work place. 

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I don't know... I just need someone to input what they truly think.  Am I a jerk? Should I fake being friends with Cat? Should I continue on being civil and not faking?  What's the deal?

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IMPORTANT NOTE: The manager that came to me today is a female manager that is subbing in for my REAL manager while he is out. She does have some authority but the real manager hasn't spoken a word to me about the situation thus far.