Oh, I've always loved thinking about potential relations this is wonderful!
Rafaic, no matter who she's with, even older kids, tends to mother people a little. It's easy for her to get along with most others so I think she'd be very laid-back and friendly but also a little overprotective over MianMian! Would probably have a pocket of her favorite candy at all times and give it to her throughout the week, methinks. They'd probably regularly meet up to chat about something lighthearted over drinks like lemonade or sweet tea (Though Rafi might accidentally yap on and on about the cool haunted place she found that's really close by for a bit too long).