The "next level"? She is leading the Diamond League right now. She's beaten Hull, Reekie, Mu, Moraa, Nakaayi, Goule-Toppin, Werro, Bourgoin, Sekgodiso, Maloney, Lamont, and others. Thats 3rd, 4th, 5th, and 8th in the Olympic final. She will rise to #5 in the World on Wednesday. She broken the 1000m Area Record twice. World Indoor, World Road Mile teams. If it wasn't for the trip, she would have easily made the team and almost certainly would have won; nobody in that field can kick like her, see the London and Monaco DLs.
I would not be at all surprised if she beats Hunter Bell in the DL Final to make it to Tokyo and then is our top American there.
She at at the top level now and there is no coach who could possibly have gotten her this far. Lauren Johnson has done an amazing job with her for 5+ years and there is no way she is ever changing coaches. That's a stupid suggestion and is not worth even saying since it will never happen.