Brandy definitely should be more involved. It's obvious most of the songs she does come from her ideas and concepts. I hope she does like Solange did and lock herself in with her pen and just work on it until it's right. I hope she trusts her own process.
Brandy already has the ability to sing just about anything and make it sound good. If she really took the time to craft an authentic, raw, unfiltered body of work, then it might set her where she needs to be when it comes to critical acclaim. At this stage in her career, there's no need to chase the charts. If she releases a really great body of work that's in her own newly created lane, she'll solidify her legendary icon status. All it's going to take is a Grammy win or two and that's it. Then, we can stop hearing that other girl say the only one they have is together.
If Brandy releases an album that has great songs that play to her vocal strengths, releases a solid 4 or 5 singles, and has great visuals throughout the entire era, there ain't no stopping her.