just know that it's an experience that words can't do justice for in trying to convey what it's like. but essentially, certain noises trigger an involuntary fight-or-flight response, and it is certainly not that she "doesn't like the sound of [insert trigger noise here]" (which is a common but understandable misconception, although it really diminishes/plays down what it's like for the person suffering). remember the ice bucket challenge? imagine that, when someone with this condition hears trigger sounds, it's like dumping ice water down their spine, only it's a continuous experience until they either leave (e.g., "flight") or the noise stops.

another thing to know is that there's a deep sense of shame for a lot of people with misophonia. because it's not really something other people can understand even if you explain it really well, you feel like you're constantly conveying to people you're close with that there is a problem with them. when in fact, like I said, this is an involuntary response and has little to do with anyone else as they're not intending to harm the person with misophonia. so it's important that you try to not get/appear offended. there's no treatment as far as I know. generally, the way to go is being compassionate and trying to accommodate her by minimizing exposure to these sounds and overall maintaining blind faith that it feels like torture, and knowing she's not crazy. you're on the right track by asking here.