Marsha....my youngest child

Okay....so for the last 8 years I've always hated taking my dog Marsha to the kennel when I go out of town. She's always been so sad and when we pick her up she's got a bad tummy. So now, since she is in the kennel often, I'm afraid she is getting use to it. Today we dropped her off prior to going to New Orleans tomorrow and she wagged her tail....waited at the kennel door until I could get there, and then couldn't wait to be taken  back to her run. Should I be offended or concerned?