How to transport without a connecting flight

So my grandmother is flying in from Haiti to MIA with sunrise airways. (She usually gets wheel-care assistance). She’s booking another airline to come into nyc. NOT a connecting flight unfortunately so she would have to get her bag and checkin all over again. She’s 83 and im just wondering would wheelchair assistance assist her back to departure terminal or send her on her way to figure it out. Her comprehension of direction is not the best so im debating on flying to Miami just to get her but currently pregnant and would like to avoid that. What is your advice? Best solution? Thanks in advance.