Don't worry about the box!
At your LO's age a 4 hour EASY for bottle feeds is very appropriate and most babies are still having 4 bottles during the day (so 7, 11, 3 and 7) for example and some will also still be having a dreamfeed and/ or a nightfeed.
Bottle fed babies tend to drop to 3 bottles around 9/10 months as solids are increasing by then and they start refusing one or both of the middle bottles. When this happens it's usual to do wake up, pre afternoon nap and bedtime bottles. Some babies drop to 3 bottles a little earlier but that's usually in cases like my refluxer when you need to combine bottles to get more in them overall.
Leave things as they are for now, especially as she is taking good feeds - remember too that the formula box is guidelines (and that's what they are, guidelines not "this is what you must do") for fully formula fed babies - your LO is still getting BM with the formula!
HTH! Don't take this the wrong way as we are VERY happy to help, but I think you are overthinking this a bit - relax and let her lead you and you won't go far wrong, honest
Laura