Mother flying LHR-JFK(AA)-CHS (B6) tomorrow.

What does she need to do with her baggage after going through customs at T8? Can the AA baggage handlers take it, or does she need to take it with her to T5? (she'll also need wheelchair assistance, so it's not entirely trivial for her).

thank you,

tb

PS I initially posted a similar question on B6 forum, which I appreciate is not great FT etiquette, but then realised this may be more appropriate for AA forum.