To Declaw a Cat?

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I recently made an appointment to get my cat declawed. My cat is my baby and I love her to death. I decided to get her declawed because she has a nasty little habbit of clawing couches, carpet, chairs, you name it. I'm buring new couches to replace the old ones and I want them to last. She's torn the carpet off he floor in some places and ever clawed holes in a leather couch. I am feeling really bad about doing it now, her appointment is in two weeks. Is there a possibility that she could be either depressed or angry about it for a long time? I know my cat is not a person, I just don't want this to effect the rest of our owner-pet relationship