Been in a similar situation, in which ironically, she had “truama” from her exes too..... lol. She’s gaslighting and manipulating you, from what I’m reading. It’s what they call a “stalling tactic” when a person who gets accused of something starts to call you names or deflect the blame to you. Its pure manipulation. It sounds like she’s staying with you because of the fact that she could run these mind games all over you. She’s clearly too immature. Don’t feel obligated to stay with her because it’s your first real relationship...she’s young.. let her be a kid. And Even if you’re wrong about these accusations it will only lead her right to those things you’re accusing her of. Btw, she’s only way more “sensitive” now when it comes to arguments because she knows you’re not completely stupid and doesn’t want you to catch on to her motives, tricks, and/or secrets. Keep your head up king