I feel you know in your heart that it was the right thing for her because your friends knew when she was there and you also saw how she loved the farm before.
She'll never forget you. Just got to get her while inside away from the horses.
As for your cat, he/she will look lost for a few days then it'll be all you. Cat's do that maybe faster than dogs.
It's a bummer, like all your hard work during the election, but we have to survive somehow. I have to now keep telling myself that, some of the anger and shock is thankfully wearing off or I'd go next door and burn that jerks 10 foot cheeto mussolini sign. And then he'd shoot me because he has a mess of weapons not counting his prison issued sidearm.
You did good all the way around. Let it naturally flow off your back in good time. Any kind of grieving is always a personal thing no one can dictate to someone.