Meet results aren't listed the way artistic gymnastics meets are. The best way I know to find results is to figure out which meets the gym attended. Some of the meet hosts or meet websites will have past meet scores listed there. Especially if it was a big meet. Also I believe the USAG T&T website will have past national scores if you spend some time searching through the site. Also check to see if they have social media sites. Sometimes a lot of meet updates are there. Or at least you can see the range of athlete levels they have at their gym.
I've found that the coaching philosophy for T&T is much different than at gymnastics. My daughter regularly has a coach from another gym come in and coach girls on trampoline. Or they go to thay gym to get a little bit of extra practice. And at meets the coaches all give advice and spot and cheer on gymnasts form different gyms. So my best advice would just be to call the gym and ask them about their gym philosophies and how many local regional meets they do, and if they participate in National competition. (I will say most of the T&T gyms have a more athlete first mentality anyway, there are always outliers where I wouldn't be happy if my daughter had landed there) So keep thay in mind as well.