It's very, very hard with neighbors, especially it sounds like in your position where she has a bit of "power".

I live on the water in a tiny town house and have two cats. My neighbors to either side of me each have three dogs. There isn't much in the way of fences; the one neighbor on the left has paved over their backyard and they never walk their dogs and there's nowhere pleasant for them to poop so they jump the fence or get out in other ways and go where there is some grass; guess whose yard :-) Luckily they mostly go through our yard and into the neighbor on the right's yard; he's the end townhouse so has a huge corner lot and, with his dogs, his yard is much more interesting to the other dogs. However, he lets his dogs just be "out" when he's out so they wander several houses and around front and wander over to my corner of the front yard and do their business where we have to put our trash for pickup (or actually up on my side of the driveway strip). And neither neighbor cleans up after their dogs.

I don't say anything, it comes with the territory of living in a small townhouse in a water community where there are numerous big dogs (it seems like almost everyone has a dog on our street :-) and, otherwise, they're pretty good neighbors, they mow the lower level of our yard where I can't, help dig us out of the snow and advise us on handyman sort of work as they've been here longer and are both professionals in the construction area.

I would think of something you might want/need and kind of keep this switcho madness as a piece of you-owe-me and, since she is association president, ask for something you want/need that she might need to pull strings for, and "remind" her, in a pleasantly teasing manner, how accommodating you were about changing parking spaces with her?

I think it's all right to be accommodating if you keep in mind your own wishes. Yes, you like the new spot better but it was originally hers so you'll be happy to give it back but it will cost her :-) Just consider that she's in your debt instead of feeling resentful.