I feel like this character is overpowered, and I'll explain why.
What does she counter, and what counters her? Well, she counters fire just straight up, which is a big one. It's possibly the most beloved arcane element to conjure, and simply by existing she is unbeatable if her opponent is fire-based. Similarly, psychic abilities don't work. Also digital stuff. So right there, she counters elemental magic, psychic powers, and digital powers. That's not being an anti-mage, that's being anti-magic, anti-arcane, and anti-technology. I believe those are generally regarded as the primary schools of any wizard world, and she passively counters them all. And she uses some magic of her own. Well.
It's just boring. I mean, no matter how well you write it, or work around it, fire based gladiators in particular are totally nullified while elemental ones are at an extreme disadvantage, whilst arcane and technological gladiators have massive aspects of their equipment immediately removed right off the bat.
And then the real issue begins.
"Her reaction speed aiming are always on point". She's "EXTREMELY, MIND-BENDINGLY experienced with one spear". "The spear(s) is a piece of archaotech, as it cuts (and pierces) through almost anything."
So your character can't be beaten toe-to-toe. She can evade anything, her blows are always totally accurate, and she's an absolute, total expert with her weapon of choice which cuts through anything. I can't hit her, and she will one hit kill me. And that's if I even get close. I can't attack from a distance because her reaction speed is so onpoint. So literally the only way my gladiator can beat your gladiator is by sneaking up on them. A ridiculously specific skill set that I'm willing to wager 90% of the gladiators are not capable of doing. At least she's blind, right?
Right?
"Al.ice can see people’s intent, as well as powerful forces (whether they be psychic, physical, magical, whatever). She can also see in a 360 degree area around her, because reasons".
So I can't beat her if my powers are magical or technological, I can't stand toe-to-toe because she's an impossibly fast and skilled spearwoman with a weapon that will cut through anything, and I can't sneak up on her because she can see in a 360 degree radius around her and I can't even sneak up on her in a crowd because she'll see my intent. She's immune to poisons, so really convoluted and distant assassination is equally impossible.
She can even open every door so you can't even hide from her.
So she can't be beaten with technology, magic, or psychic powers. Her capacity to kill at close range is pretty much guaranteed considering that she's impossibly fast and accurate, meaning she can evade anything and strike faster than you, and even if you do block it the blade will go through because it can cut through anything. You can't kill her from a distance because she's got wicked fast reaction. You can't sneak up on her because she has 360 degree vision that even includes the intent of the attacker so you can't use a crowd as cover. You can't poison her because she's immune. You can't hide from her.
Your weaknesses are that she's blind, which you literally say is pretty much pointless because she has her other sight which I would wager is better, her abilities have cooldowns but who cares about those, they're pretty irrelevant considering she wouldn't even need them to beat anyone, she's physically frail but who cares if your spear will pierce everything anyway and you can dodge anything, she has a caustic reaction to pure iron and gold which is irrelevant because no one could ever hit her with them. The only reason why blindness would be a problem is if "someone has something that targets the blind" but what kind of gladiator or power would have that?
Your character isn't just overpowered, it's overpowered on a scale I haven't seen for some time. You really need to think about revamping this character a lot.