My snakes yawn, or stretch. Usually it's when I get them out and if they are out too long they get sleepy and relaxed and almost always yawn. I think they do it when they are getting ready to go back to sleep too.
I can't say I've ever had one yawn at the pet store, but they have on the way home. Make sure you trust your pet store to the fullest extent. It doesn't take much to get mites from newly ordered snakes.
Other than that. I don't think it's anything to worry about.
It's not necessary to feed outside of her enclosure. The only reason pet stores do it, is because they keep a lot of snakes in one tank, and you can't feed them together. But, it's a really good idea to put the box in her enclosure and let her get out on her own. As long as she is healthy, you do what makes you comfortable.
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