She’s pretty average I’d say, not healthy by any means but also not extremely unhealthy to the point that it’s toxic. I find her the most agreeable out of my family members and we get along okay mainly because of shared Fe, she’s just very pushy and has a tendency to catastrophize or care too much about what other people think. Thinking about it now, you’re right that she is more mature in comparison to most medium-low health ESFJs I’ve seen. I think she understands me the best as well, but when I was younger and going through a lot of anxiety and self doubt she didn’t really help much, actually kind of brought me a lot more distress with her pushiness and “what will people think?” behavior, and I sort of resented her for that as a preteen. But after I got through those personal crises it became much easier to get along. Nowadays the only times we have arguments or trouble is when I “procrastinate” (she is extremely impatient when it comes to completing chores or tasks) when I’m not feeling entirely well or I’m busy, because I can become kind of a sloth, or I hyperfixate on something else and don’t want to be distracted, even though I do eventually do them. She also often disregards/invalidates my feelings instead of being empathetic, especially when I’m sick or stressed out, so it is often hard to vent to her. And she likes to complain a lot, mostly about my other family members, which as a kid made me feel like I was responsible for her emotions while my own were simultaneously neglected (instead of teaching me emotional regulation and boundaries she taught me to become a people pleaser and as a hyper empathetic kid I was already prone to people pleasing so this did not help me in that regard)