My son and I both shoot PRS/NRL, your on the right path. 135 is a great bullet and so is the 142SMK for that cartridge. So some help, I'll give you a quick load work up on said combination for guidance. As always you still have to work up your load making sure your not showing signs of pressure. Also when shooting groups on those targets at 100 yards, dial up .2 and set your crosshairs on the aiming spot, the cross, so your bullets will print in the square above. This will give you a clean spot to aim every time and reflect a better representation of your groups. What I look for is a flat spot with respect on SD and ES as well as groups that print consistently in the box. For your daughter if I were going to buy one bag to shoot PRS/NRL type matches I would get a gamechanger by Armageddon gear! With that bag you can use on 80-90% of the props you will shoot off!
As far as your load is concerned I would say 2750 - 2810 FPS, with accuracy and Percision would be a good sweet spot. 4-5 loads out of Hornady brass is all I would expect before the pockets get loose and really are no longer useable. Lapua with with CCI small magumn primers if you choose to go that route will go at least 15 firings. Note the quick load Data will not interchange because there is less internal case capacity with Lapua brass! If you want that info as well shoot me a PM.
hope this helps? Be safe and have fun!