Anne is way above both Kagura in skill tho, let me elaborate:
Anne was trained in swordmanship and martial arts since childhood and was as a recrut already immensly above experienced and skilled Knights in raw skills. She was in fact so above them, that Mother Knight, the very first Knight to ever exist, recognised her as a genius and gave her 2 AB Swords (Context: AB Swords are vital for Knights and are immensly rare, due to the limited material), something that only Anne archieved. After becoming a Knight, she quickly rose to the rank of a Master Knight, Knights who survive planetary wars and fought and surivived against Zero Types. Meaning that they are even more skilled than normal knights, who literally bring swords to a mass gun fight and win. But this dosnt stop here. Anne participated, together with Pray, in the Veelches war. That very war shoulderd the entirety of humanity on it. It was such a brutal and unforgiving war that Knights and Master Knights alike died left and right. Fodder beasts in that war manhandled normal Knights and threatend Master Knights in masses.
That war introduced the Cross Eyes, a Zero Type Duo that soloed entire armys of Knights and Master Knights with utter ease. Anne and Pray engaged them in a duel and killed them, winning the entire war.
Another Skill feat of hers was when she engaged a group of Knights in combat. She was unarmed and had to fight against dozen of them at the same time, every Knight, armed with actual weapons and intel on her, rushed at her. She oneshotted them utter ease, bare fisted. She did the same to 3 Master Knights, one of them being a Veelches War comrade, Likewise oneshotted, even though they all attacked coordinated and at the same time. This all happend in a single fight.
I could add more on Anne's skill, there are more feats but i this is not a fangirl post about Anne so i will keep it for myself for now.
As for her gravity hax, i doubt she would manage to pinpoint Anne with enough force, considering that she used it against characters weaker than Anne. I dont doubt that she can apply enough gravity to absolutly seal Anne off, but she would need to know first that she has to apply more force in the first place. And she wont get that intel because Anne finishes near all of her fights in 1 to 4 hits. Not to forget that Anne can amp her sword strikes with Wave energy, creating energy slices that travel further than her normal cut. One bad blocked attack will kill Kagura.
