It looks to me like your neighbor was over-sunning the Catt. The worst-looking leaf was probably getting the most of the sun, and that's why it's looking yellow and wrinkly. It appears to have some black sunburned spots on it as well. You may lose that leaf. The other two look like they should sort themselves out. I would get this particular Catt into lower light for a little while to let it recover. You can give it some Superthrive in the water, too, to help it bounce back.
In my opinion, overwatering or underwatering would be unlikely as the cause here, mostly because of the short amount of time in which the damage occurred. Persistent underwatering will cause shriveling of the p-bulbs and wrinkling of leaves over a period of time, but I don't think it would happen in just the couple of weeks that you left it with your friend. And over watering would take even longer to show up, because the roots would have to rot due to the standing water before the leaves would show any signs of dehydration. I'm pretty sure that yellow leaf just lost too much of its moisture due to extreme sun.
In good news, the other leaves appear to be in fairly decent shape. I see a slight bit of purplish discoloring on one of them, but that's most likely just pigmentation from the sun.
I think your orchid just got shocked by some conditions that were quite a bit warmer and sunnier than yours! Give it some time and some TLC, and it should bounce back.
Oh, and as far as your orchid feeling "heavier" when you picked it up, my guess is that the caretaker noticed something looked awry and was trying to compensate by giving your orchid a lot of water before returning it to you, so that you didn't accuse her of causing the damage by letting the plant dry out.
Hope it bounces back quickly for you!