<human>: Give me a shortened version of the text

To cut a long, irrelevant explanation of circumstances short: my wife is going to be leaving her cat, Zoe, with her mother - who also has a cat - for five weeks while she's visiting me in Scotland.  
  
I'm kind of concerned about the impact this could have on either cat. My wife's cat, Zoe, is female and about 18 months old. She's an indoor cat and has never been outdoors without being in a pet carrier. She's pretty big and muscular and has a keen hunting sense. She is also very independent and doesn't like being held at all (the shelter my wife adopted her from had named her Freedom because she hates being held so much).  
  
My mother-in-law's cat, Butterscotch, is roughly 3 years old. She's also an indoor cat, but is allowed to roam free in the basement and often hunts and kills mice, so she has picked up a kind of outdoorish lifestyle. She's fat and very affectionate and a bit lazy.  
  
My concern is that Zoe and/or Butterscotch will be spooked and/or mentally scarred by suddenly having to share territory for 5 weeks. I've heard that cats can become very stressed out if they're aware of another cat in their space. The plan is to keep them separated but I'm really concerned about their well-being.  
  
Is this kind of arrangement a good idea? The other option is Zoe staying in my wife's apartment and having my wife's friends visit Zoe every day to feed her / play with her / give her a bit of company, but we're concerned about Zoe being alone most of the time.  

Any advice that can be offered would be greatly appreciated, thanks for your time.
<bot>: My cat is being left with my mother-in-law, who also has a cat, for five weeks. We're concerned about the well-being of both cats. Is this a bad idea?