Possibly A!Otter was killing another anomaly wanting to be the one to hunt Serval. Then left because having grazed her, she's now A!Serval. Or it doesn't matter if Serval dies now because the flower will get her eventually anyway.
I take it as a "not my target" situation, A!Otter has no reason to attack Serval as she's not one of the Giant Otters and nothing more.
The Galar fossil Pokemon are composed of four possible parts, two heads (electric and water) and two backsides (dragon and ice) that can be mixed and matched to create four possible different Pokemon (Dracozolt, Arctozolt, Dracovish, Arctovish). But this seems to be a combination of all four parts, producing a Pokemon that doesn't exist, so how to go about tagging this?
She appears to be wearing off-shoulder type of dress. What confuses you might be the scarf around her neck. Her right arm is simply blocked by her body.
Watch as people draw her without a right arm anyway just because it looks like it's missing.