Should my friend consult legal representation before speaking to detective?

my friend is being interviewed by a detective, a man that she didnt know, but was in her car fell from an overpass on the freeway while throwing up. she saw that a car below stopped and was calling 911, she drove off, she came back 10 minutes later but the ambulance was already there. she knew he had help so she left. She just found out the man was in a coma and has died and now investigators found her and want to question her. Should she consult a lawyer? Will she face charges for failing to stop and render aid?