Telouborg, just spot dodge the dive kick and she will land with lag, the more move she used in the air, the more landing lag the dive kick will have.
Let's do some maths :
spotdodges have 9 or more frames of lag after invincibility
+
Dive Kick has 20 frames of lag when it touches the ground
=
If you spotdodge perfectly the dive kick in order for its landing hitbox to come out on the last invincible frame of your spotdodge you have 11 (eleven) frames to punish it. If you are not frame perfect though, you have less. Let's say with practice you get the timing with a 3-4 frames window, that means you have 7-8 frames to punish Bayo's dive kick.
8 frames to punish something that has a zero to death potential or at least will inflict 40%. Imagine MK's Fsmash dealing 40% or killing at 15 if you will.
Witch Twist is pretty hard to connect without a set and all her other moves has at least 7 frames of startup (even grab).
As Rawkstar said this is untrue. Bayo is the only character to have frame 1 dodges and on top of that she has her frame 4 up B and frame 5 counter. Let's also remember that startup only matters when it comes to trading or combo breaking. Bayonetta has a frame 1 combo breaker, that's a feat only a handful of characters have (Jiggs, Ryu or Marth for example).
Bayonetta has an overall poor mobility.
Bayonetta has an overall poor framedata.
Bayonetta's specials has nice reach, but her normal moves (without BA) doesn't and her special involves the risk of landing with a lot of lag.
Ok this is where I draw the line.
The blatant misinformation stops right here.
You do not say about a character that has up to 4 air dashes in 5 different directions, a side B that low profiles most high attacks and a stall-then-fall Dair that it "has an overall poor mobility".
Neither do you say about a character that has more or less 20 frames of lag on all her combo starters that it has "overall poor framedata".
"Her specials involves the risk of landing with a lot of lag" is true only if you use multiple specials while in the air, and if you do it is because you combo'd someone with said specials, in which case they'll either be too high near the blastzone to punish your landing, or simply dead.
If you use multiple specials consecutively in the air while in the neutral I'm sorry but it's not the character that's flawed.
You want a character with poor mobility ? Try playing DDD, Dr Mario or Duck Hunt.
You want a character with poor frame data ? Try Ganon, Palutena or WFT.
Try harder.