It depends. If you’re her “safe” person and she’s venting to you about something & you just don’t like her tone, that can seem insensitive in the moment. Sometimes people get louder or more exaggerated when trying to express themselves; especially when frustrated. If that is the case, timing is key. Perhaps once things settle and emotions aren’t high, you could mention “hey— I’m glad you felt safe to share those hard feelings with me, but your tone made me a bit uncomfortable.” Just a thought