My bigger concern is that your daughter isn't happy when her positioning isn't just right. There really isn't any way to adjust how you sit on most rides. I think your best bet is to split up sometimes. For your DD, target rides and shows where she won't need to transfer. I know she needs chair breaks, but I don't know if a ride is the place to do that since there's no way to adjust her so she's comfortable. Get FP for other rides she may not want to do or would need to transfer for.