Rih's music tends to be more on trend; Bey veered outside of that with 4 which slowed her pop radio momentum and also she's doesn't have a proper manager since letting go of Mathew and that has had its effects on the way things operate with her team. Her single releases are chaotic with no international uniformity, unnecessary dual releases, debuting songs via SoundCloud and videos and not releasing to iTunes for weeks or months etc. -- all this on top of barely there promo if any support. She also never does radio deals to help with launches.
Bey has a strong catalog of hits tho so they're really not making or breaking her at this point, anyway.