That's just odd. Now someone can tell me if I'm wrong, because I don't follow Instragam, but presumably B was wearing this cuff, bought/ordered from a store, and the bracelet had actual diamonds?
That's just a FU to her child's father. I seriously doubt her daughter went up to B one day and said, "let's spend lots of money ordering a diamond bracelet for Mommy to wear that says I love your current boyfriend." Nope, her daughter might say, "mommy, I want to make bracelets that say I love Mommy and Daddy" for the them to each wear, but B wouldn't like that.
Never mind, once she breaks up with Paul, which is guaranteed to happen, what does she do with the cuff? Recycle, hope the next guy is named Paul?
I agree with others who say a child can love more than one person, but we have zero idea what this child really thinks (as it should be, she's a child for crying out loud!).