maybe she is frustrated iwth you for some reason? like shes expecting something that youre not doing. i suggest having a sit down talk with her to ask her what has been upsetting her about you? like ask what it is shes expecting of you. and dont take offense if she tells you but listen. and find out maybe shes super stressed over something or maybe somehow something about you is triggering her in an emotional way. maybe it was her being your age or you never know. try to find out the root cause of why shes been so easy to blow up at you and tell her you love her and want to get along better.

Sorry to hear what you’re going through. Has she always been that way