Why did Lisa Bonet kinda disappear?

Lisa Bonet was a big deal in the 80s because of her role as Denise Huxtable on The Cosby Show.  She married Lenny Kravitz, had a daughter (Zoe, now 20), they divorced...she continued to act in random roles here and there, but hasn't been very high-profile since her sitcom heyday.  (A Different World was her semi-successful Cosby Show spin-off.)

In mid-December she had a son with actor Jason Momoa.