Reasoning in comments

She does exactly what he does but doesn't need a reality bending gem to do it

Except she CAN'T bend reality
so he could just turn her inside out and-
ded

Yep

I know y'all are going to say "but Edgyhead is much stronger" but y'all probably didn't read her abilities. If whitespace Inkmatas even gets one hit on Edgyhead, Edgyhead would start rapidly bleeding and there would be nothing he can do about it

The Traveler: But i can dodge em

*Whitespace Inkmatas shoots a barrage of 20 bloodstone skulls everywhere*

Edgy: *fixes it with the Reality Ruby*
I think you're forgetting
I CAN CONTROL REALITY WITH THIS

*The bleeding doesn't stop as the power of Whitespace overrides the reality ruby*
Whitespace Inkmatas: Eggs are delicious

AU ver:
Edgy: Enough! *she falls into a portal underneath her into the Reality Twister*
We're in my domain now!

Edgy: ALRIGHTY THEN
*he regenerates at a constant speed so he's basically losing no blood*
I personally have never tried it, but my friend Starved Eggyhead loves calamari!

*Whitespace Inkmatas launches 20 bloodstone skulls at Edgy, they all homed in on him*

Edgy: *still standing* Pathetic.

*The skulls all hit him. He bleeds at a ludicrous pace. He was also internally bleeding meaning he couldn't regenerate*
Whitespace Inkmatas: You lose

Edgy: (he can regenerate anything, except if you hit him at a few key points, but nobody knows where they are)
I'll admit... You're tough, and a worthy opponent... BUT WORTHY DOES NOT MEAN STRONGER.
*She gets trapped in a hollow but indestructible Ruby*
Listen... The two of us share a common enemy. The Collector and his friends. Join my team, and you can have all the power you could dream of.

Whitespace Inkmatas: *Muffled* Let me think about it

Edgy: You'd truly make a good addition to our team. Don't worry, I won't let Starved Eggy eat you, if you agree.

Whitespace Inkmatas: You will need to find blood every day or so so I don't try to feast on the teammates

Edgy: well we have a lot of prisoners in our palace...
Just, DO NOT go to the largest cell in the back.

Whitespace Inkmatas: I'll just feast on their blood

Wha-

Holy
I would be Dead if i tri ed to fight inkmatas