It did get to be too much sometimes, "I grew up in a busy home," Winterfell was usually busy, being the central fort of the North. "It's just..." Well, Torunn had siblings, so she likely understood, "Sibling stuff."
Their dynamic was odd, there wasn't that much time between their births, but they grew up so different, and then they had such vastly different experiences. "It's just better to walk away and get some air sometimes."