Rosa Abbott

I've always been fascinated by Rosa Abbott and since finding this place I'm deciding to put my genealogy skills to good use and see what I can dig up about her.

I did find her sons *online* birth records in Providence and their birthdates. She is listed as Rhoda there as well. I also saw below that she had the surnames Williams and Smith as well? Of course I also know what I've read in her biography on this page. Can anyone tell me anything else about her that may help me in my research? Thanks in advance for any info!
Also, I forgot to ask. I've read that Stanton Abbot was Englands middleweight champ, and ALSO America's middleweight champ. Does anyone know which of these is correct?