1 year old niece is a type 1 diabetic

Lexi

So yesterday was my nieces first birthday. We were getting ready for it and the last couple days she has been acting weird. My sister, brother and I are all type 1 diabetics. Nobody knows why or how we all ended up with it. But anyways my sister felt like she needed to test her blood sugar and it was over 600. Any advice would help. She’s doing ok and in the hospital. What would life look like for her being SO young? My siblings and I all got diagnosed around age 4.