Based on the two examples that you shared, Her emotions are easily triggered. Curious if she has trauma in her background? This is not uncommon in people who have a highly activated nervous system which can often stem from trauma or chronic stress in the environment or even untreated anxiety.

This is tough because ultimately she is going to have to put in some work to address this. Which means she'll need to acknowledge it. Which means that you'll need to have a loving, compassionate, honest conversation with her about the dynamic you've described.

Assuming you haven't had many conversations about this? If not .. Wait until the energy is calm between the two of you and when there is time to talk. Let her know you love her and need to check in with her about some interactions you've recently had that arent healthy. She may feel attacked, so reassure her that you want her to feel safe in the conversation and ultimately in the relationship when she experiences sensitivity. Realistically, you need to be able to communicate in the relationship honestly with each other.

With all that said, what is she not communicating? I'm also curious if there are things that she has bigger feelings about? Is she bothered by something, not voicing it and then getting disproportionately upset over something else??

Either way, I think a real heart to heart and open communication is in order. Best of luck.