Wow, thank you all for the responses! "この小娘" seems to be the correct answer. And I'm so sorry, I probably should have posted a picture of the whole scene instead of just the dialogue bubble for context! I included below a picture of who is speaking and who he's speaking to. So, does "この小娘ミッツ" altogether mean "you immature girl!"
https://imgur.com/8BB2ATj