i can see there still being a little bit of a hangover from their younger years in that dynamic (and lailah has a bad habit of speaking her mind without really considering the words that are coming out and how they may affect people), so i'm sure she'll say the wrong thing and that'll lead to inevitable minor blow ups (as tends to happen with sisters!). she can be annoyingly stubborn, but when she's actually wrong she can own it and apologize and pour on the affection to make up for it