You'll want to get the full spear duration to midair stall as long as possible, and also want to be as high as possible because the flower will stop and start attacking once it drifts into range. I found just bottom right of the flower bud to be the best spot to spear at since spear can hit the ledge if you're closer (as seen in last clip). Requires full silk enter.
dash clawline on this part is easier than just jumping at the nub since the sloped ceiling of the nub will push you down into the correct height Clip 1. Aim to dash at the middle, using the pillar in the back as a reference. While jumping earlier is possible, it's not as easy as the timing is harder. Clip 2. Don't jump too late, you can be pushed too far down, but this is pretty lenient Clip 3. Bonus: you can claw the nub and still make it as long as you're far enough left
Phantom dive is free dmg if you pogo dash it, just make sure not to pogo into the direct middle or you won't dash out in time to avoid getting hit Edit: Phantom's hitbox window is 3 frames, nail slash is 6 frames, and pogo lasts 8 frames, so this is the best and most lenient strat to punish the slam. You also have more time to react because you don't need to be out of the pillar to punish.
I'll throw this in here Notch on the floor makes for perfect dash distance Background vine is perfect distance to dash-heal Pretty lenient overall and heal should always go off so you can do it even at 1 hp
(LEFT) you can upslash and dmg tank instead of pogo to land final hit faster. (RIGHT) There's RNG on how faster she does dive attack after MM gets staggered, if you only get 5 hits instead of 6, you'll be short 1 but you can do an upslash, dmg tank, pogo, into slash instead. Good luck lol