Spears' father, James "Jamie" Spears, filed the petition to dissolve the conservatorship last month after she filed to replace him with a professional conservator.
A hearing to review the suspension and a petition to end the conservatorship is set for Nov. 12, about three weeks before Britney Spears' birthday.
Rosengart told reporters and fans after the hearing that the ruling was a "substantial step toward [Britney Spears'] freedom."
Britney Spears' fiancé, Sam Asghari, posted on his Instagram Stories after the news, apparently holding a rose with the singer in one photo.
At the time, Britney Spears had suffered a public breakdown under a barrage of intense media scrutiny.
Her attorney, who filed to replace her father as conservator in July, has accused him of mishandling her finances.
Rosengart has accused Jamie Spears of mismanaging his daughter's finances, profiting from the conservatorship and using Britney Spears' estate to pay to rehabilitate his public image. »