Honestly Sombra was in a good place before brigitte came out. If you look at pick rates in Stage 3 OWL (which is playing post Sombra rework and LoS / 2 second changes, but before Brigitte), Sombra is on par with the majority of heroes in the 5-15% pick rate range (only widow, and the dive heroes are above that range).
She’s just really bad against armor. Hopefully the coming nerfs to Brigitte’s ult will help Sombra out a little.