Nicole Black got a call around 1:45 a.m. on July 4 that her daughter Crystle Galloway had fallen in the bathroom of her Tampa, Fla., condominium and that something was wrong.

She had hit her head, Ms. Galloway’s daughter said, and by the time Ms. Black raced from her home two blocks away, she was slumped over the bathtub, foaming at the mouth and her lips were swollen.

Ms. Black called 911. Later that day, Ms. Galloway slipped into a coma. She died five days after.

But weeks later, questions persist about what happened after the 911 call and whether race played a role in how Ms. Black and her daughter were treated. Four emergency medical workers have been placed on paid leave and face a disciplinary hearing on Tuesday.

Ms. Black said that the responders told her she could not afford the $600 ambulance ride to take her daughter to the hospital, and that she was directed by the medics to drive her there on her own. Ms. Black said she believed her family was treated poorly because they are black.