What I did with my TPs is to consider two factors: first, what were the longest waits in my touring plans, and second, which would be the most difficult FPP to obtain as we approached the trip. I tried to minimize my waits, so I didn't really care if it was Tomorrowland Transit Authority that we grabbed a FPP for; it was the attraction on my plan that had the second longest wait time projected. On the other hand, I grabbed a 7DMT FPP for later in the week in case my kids wanted to ride it again. I figured if they didn't love it, it would be much easier to get at FPP on something else close to the day, but if they adored it, I wouldn't be able to grab it so close to the time.
Also, to my mind, minimizing waits (with a 5 and 2 year old) was my goal. I felt as though it was a better to get a FPP for Journey in to Imagination than not. Even if the line is only 8 minutes, why not wait 2, if there isn't anything better to get a FPP for? Because I'm traveling with small children I am taking a long break in the middle of the day. We chose to go for longer and do fewer attractions in each day. So we had more opportunities for FPP.
If you think your daughter is close to the height restrictions, AND is the type of kid who would want to ride, I think you should plan as though you are doing the headliners. It's much easier to delete those to your plans, or skip ahead, than it is to try to add them in at a later date. Also as you do your plans for each day, you may be surprised that the headliners aren't necessarily what you want your FPP for. For instance, Peter Pan and 7DMT will certainly have lines equal to the mountains.
The caveat to all my advice is that I've spent a lot of time drawing up plans, but am not actually going til October