I recently had to board Snickers. I researched boarders and found one that was a "luxury" kennel. I don't know if I'd call it luxury, but they did have the cats in a separate sound proof room from the other animals. They had big cages and let each cat out individually once a day to go into a play room, where there were cat trees and other kitty toys to play with. The price was the same as boarding at a vet - about $12 a day.
Despite all that effort to make her comfortable and happy, when we picked her up, she acted much like your cat. She's not a lap cat at all, but apparently she curled up with my boyfriend every day and followed him around the apartment. We've kidded around ever since we got her that she has abandonment issues (because we adopted her after she was found in a woodpile as a kitten). But whenever she first comes home from being boarded or the vet, she REALLY does have abandonment issues and always acts needy. We actually love it when she's like that because she's extra sweet. But it never fails that after about a week of her being all lovey dovey, she realizes we're not going anywhere and goes back to her independent self that just uses affection to manipulate us into giving her food!
So I doubt being boarded that one time will scar your kitty for life. It'll probably just take a week or so for her to readjust.