I always had the headcanon, that you could divide Twilight’s original group of friends into pairs of best friends, based on their mane. So that’s Lemon Hearts x Twinkleshine, Lyra x Minuette and Twilight x Moon Dancer (which means Moon Dancer’s change of manestyle just got a new layer of depth).
I also like to think that Lyra refers to Minuette as her “old best friend” and Bon Bon as her “new best friend”. And of course, they hang out a lot.