My dad is on dialysis & he went to 2 treatments when we stayed at POFQ 2 yrs ago. His center here in OH made all the arrangements in advance. If your Aunt has done that, then they should be able to give you more info, as there are quite a few centers in the Orlando area. Or if you mean she is doing dialysis in Celebration, FL....well in that case I can say it should be about a 15 min. drive.
My advise also is to get a wheelchair at check in to use for getting around POR. On dialysis days my dad was drained.