I think my youngest is an old soul

My youngest is 2 years old, turning 3 next month. I've been noticing some unusual behavior for someone her age. I suffer from endometriosis and I also get bad migraines at least twice a month. Whenever my endometriosis is at its worst, she will stay by my side and hug me or cuddle with me or gently rub my face. It doesn't matter if I am laying on the bathroom floor. She will be there with me, comforting me. Earlier I had a bad migraine but was doing my best to hide it while I was waiting for meds to kick in. She came right up to me, sat beside me, looked at me, put her head against my head, and hugged me. She told her sister,"Leave Mama alone because she doesn't feel very well and her head hurts". I hadn't even mentioned anything to them at all about my migraine because they are kids and I don't expect them to understand or care. Either she's an old soul or she has a lot of empathy for such a little person. My other kids don't act like that, and especially not when they're little.