I only ever remember gyms I trained at having posters for things like qualifiers to JO Nationals/Easterns and a few for one girl who got a few 10s as a compulsory gymnast. There might have been more, but that was at the first gym I went to and a long time ago so my memories are a little fuzzy. The other gyms I trained at I don't remember really having any kind of banners except maybe the ones given out at meets as awards.
One cool thing the first gym I trained at did was have a wall for everyone who scored 9s. If you got a 9 one of the parents would make a really cute award type thing with your name, level, meet, and score and it got put on the wall. So the level 4-10 were all on the same wall and it was a really cool thing, especially for the little ones. At the end of the season they would take them down and you could take yours home. I still have mine from over 10 years ago.
Let Dani know that she did a great job whether she has an individual poster or not. Her 2nd place scores certainly helped her team and she played a big part in them earning that 3rd place banner. She has nothing to feel bad about, she did a great job at states and all season! I'd love to have Dani on my level 4 team, I'm amazed at her dedication, determination, and how much she has learned in such a short amount of time in gymnastics. So banner or not, I think Dani is pretty great!