I understand your anger and sadness.
I would feel the same way.
I think declawing should be illegal, and only done for medical reasons. I can't fathom anyone saying they love their cat, but having something like this done to them. Sounds to me like they love their furniture more (though I must say, I have 4 paws-with-claws cats currently, and my furniture is just fine (though Simon likes to scratch on my puzzle mats. Fortunately, I love him more than the mats).
Unfortunately, the deed is done.
Yes, I've known cats who've gotten along fine declawed, though many declawed cats walk more on their feet than on their toes like normal cats, and muscle atrophy can be one side effect.
Also, declawed cats can become biters, because their main form of defense has been torn away from them.
Also, I once adopted a declawed cat who had litter-box issues: she would do #2 in the pan, but not #1. She would instead pee on clothing and rugs, but very politely cover it up, trying to be good about it. I am 100% convinced it had to do with her declawing. (I found a solution in putting two folded-up towels in a litter box and she immediately began using it, diligently folding the towel over her 'business'. I kept the box next to the washing machine, and tossed the towels in at the end of the day.
Your cat's feet will be very sore for a while (I remember seeing the pain in the eyes of a cat at the shelter who had just been 4-way declawed
). BUy some special litter that will not be rough on her feet.