She has regeneration it isn't really far fetched to me that an evolution can fix her. She would be able to regenerate there are so many powers and their power has some water based ability too if we have so many wild shit happening int the game so just a head getting repaired to even the fil body doesn't seem far fetched to me.Not to mention we haven't seen from how bad of situation can Evolution save you hells this might be another feature for the twins that a twin can b saved it one twins survives and an evolution occurs on the surviving twin and brings back the dead twin.The game has so much mystic side that it is not some but thing in my mind at all.
On a personal note tho I care about Amber surviving Liz even though has improved in my eyes still isn't that likeable to me.
But the real
question is if its too late.
There has to be a 'limit' here for how long she's been dead for.
Don't forget time still goes by when fighting and I doubt Cole will give MC the luxury of time to heal his Waifu...the fight is gonna drag on and even more time will be lost.
It doesn't really matter if they can regenerate if its too late.
Amber could evolve but it could be all the while too late for poor Liz.
By the way this is presuming Amber isn't dead.
If she is then I view evolution completely out of the question (wasn't she fucking passed out prior to Cole showing up?) She probably died in her sleep, no chance imo for evolution in that situation.