I think it has something to do with the BFF points. It seems as though someone got another character from neotchi and they had lots of BFF points. You keep getting Coffretchi perhaps because of low BFF points and perhaps care misses as well. But this is just my theory. :)
When I bid on my Yellow P's mine ended at $15 and I was astonished because the last one I bid on got almost to 70. So I think depending on the item you could make more.
So if you don't have one you can get her on you must just run one that's pink? What if when you hatch you get a boy? Must you reset or can you still participate with a boy?
and this bit is strictly just for me. :) I'm currently running my P's already, 8th gen. I'm trying to achieve something...
I recently had one lost as well, first time for it too. It was my blue Tamagotchi P's, ended up at ISC New York on Jan 4th and hasn't moved since or hasn't been scanned again at another location. But I know it's gone, I've contacted the seller and got a refund :(