She probably did think she had the support, but regardless, what she said in criticism of Trump (calling him a racist) flouted procedural rules and it appears that the parliamentarian, who decides whether things are being done according to parliamentary rules, either agreed with the GOP objection or was about to do so. She would have been silenced for the rest of the day, so maybe she just decided to storm off to save face.
Cool. Now I am wondering things like who gets to pick the parliamentarian, and if he/she needs to worry about being “Seth Rich’ed” now....