Definitely work the L7 skills sooner rather than later. Drills for them I mean. If you start working the drills early, it'll be easier later. Set up one drill on each event as a station for them on the way back from doing "routine" skills. Bars is one place you can start working some L7 skills now. For example they can compete a cast to handstand if they're ready, or a high free hip/free hip handstand. There is also the option to do a layout flyaway if they are ready. They do not "need" any of these to achieve a good score, in fact it might pick up more form deductions. But for an invitational, I say go for it and get the experience competing it in now. By states, if the cast HS isn't good enough, they can switch to a lower cast and it will be easier then anyway. In early invitationals around here, most of the competitive gyms do encourage the girls to try the cast to HS, even if they risk going over or picking up form deductions, because in the long run it is a learning experience for later development.
There is a cap to the deduction for text errors (doing the routines different from the compulsory book in terms of arm movements and small stuff like that), I think it's .3 or something. Still, that's an unecessary .3 and getting that on beam and floor just set you more than half a point behind in the AA because you did too many arm movements wrong, you know? Definitely watch the text errors.
On beam, the dismount (front HS, 1/4 turn to side HS, 1/4 off) is a killer. HS hold is a big thing you should be working for confidence and proper execution of the dismount. Huge deductions are associated with that darn dismount and that's the biggest deduction for most. You will see a lot of girls do the first 1/4 almost as soon as their hands touch the beam for the front HS. It needs to be held.
On floor, the back extension roll seems to be a kind of ignored silent deduction getter when I watch routines. I see arms wide apart hindering the skill, bent arms, significant arches with head out, stepping out before showing a true HS with legs together. And these are from girls where the routine is otherwise good. I think that it sort of runs by because it is a skill they've had a few years. I won L6 floor at state (old routines obviously) and the difference between me and a lot of people wasn't execution of the skills like back tuck, it was that I did that old tour jete, back walkover, back extension to knee with a lot of precision (hey I had a romanian coach when I was younger). My back tuck was the same as any other good optional tracked 6, decent but obviously a L6 back tuck. Also that part in the new routine before the back walkover (near the end) where they kick forwards and do a half turn to scale, lots of dropped legs there. Another easy thing to fix. Have them do where they lift their leg above a box and execute the turn, trying not to touch the box at all.
Of course the difference between good and wow is the attention to things like strong arms and tight fingers (not straight hands with the thumbs sticking out! My biggest pet peeve). This is kind of my philosophy with girls who aren't optional tracked and are a little weaker skill wise on say, vaulting and bars. They can get more competitive on beam and floor by spending more time just making their routines look super sharp with good presentation.