I just think she's angry that Alice outclasses her. Hence the collecting guns looking for an advantage, hence the malicious glee at the prospect of being able to hurt someone who's with Alice, hence the eventual just giving up when she's used up all her tricks and been forcibly reminded that hurting those people isn't a good move for her.
But it's fairly clear, I think, that both she and Alice can detect each other at a distance - before seeing each other. Alice knew to tell Gavia when to shields-up, and Malice knew when and where to open fire even before she had seen Ardent and Gavia. Which it would have been more or less impossible to see Alice without seeing.