I don't see the sobfest here. Solange doesn't seem to CARE about being famous, let alone being in Beyoncés shadow. She seems to resent fame a little tbh.
Solange is her own artist and I'm sure she is just fine doing her own thing. I mean if your sister is Beyonce you don't need to be commercially successful, I'm sure her bills will be paid regardless. Besides Solange has waaaaay more swag than Beyonce and the public recognizes that