My advise would be to take her to try out for these "top tier teams" and objectively/honestly evaluate where their pitchers are vs where your DD is talent wise. Even if these teams don't pick your DD up on their roster, they should give you honest feedback on what she needs to work on to reach the next level. Hopefully your DD will use the experience as motivation to continue to work hard on her game. I can tell you from experience that, at her age, there is a lot of growth in a short period of time. If your DD is throwing mid 50's with spin and control, then there is something there to really build on and she'll be fine. Also be warned that, if a top tier team picks up a kid as a #3 pitcher, she most likely will not get much mound time. Every team that my DD has been on, the #3 would just get garbage time. But thats a whole other topic.....
When I would take my DD to tryouts at that age, I would tell her that "The plan is to get you on the field with the best kids around, and see how you stack up. Learn from them, and leave here with something to build off of. If these teams offer you a spot, great, but that is not the plan for today." This seemed to be a good mindset, and also helped calm her nerves a bit.