What is her current routine like, and what are the times you need to be out? That's often a better place to start

That said, if she reads the plan

then I'd just have a couple of comments about the plan above. First I'd probably drop the 9.30 and 12.30 breastfeeds and just go for a wake, feed, A time, nap cycle - so feeds at WU, after each nap and before bed. Second I'll be honest and say I think the plan for a 2.5h afternoon nap is optimistic....nice if you can get it and have a GREAT napper, but neither of mine did naps that long until on one nap. But you may get lucky! Do you have a sense of your LO's sleep needs?
I guess the only thing to do is try it and see what happens?
If you need a later bedtime I would try to have the afternoon nap coming later (if you can do that without LO getting OT) by just slightly pushing that middle A time x