I suggest not responding to her about it at all. Her dismissiveness about your issues tells me she doesn’t want to hear it. She’s not your therapist. So don’t confide in her. Find a more compassionate friend or a therapist to confide in. Keep posting here where people want to discuss.

One of my sisters is this dismissive as well, if I ever try to talk about my issues. That’s why I am familiar with your feelings. I know that my sister is one whom I cannot discuss myself intimately. She doesn’t want to hear it. It doesn’t mean she doesn’t love me. It doesn’t mean we can’t be the best of friends and sisters. She just doesn’t like to get deep.