Isn't it possible, too, that she just took off with her son for a little vacation in FL? The pandemic is causing a lot of us stress and I can empathize with the desire to just get away from life for a bit. Perhaps it was a very last minute, impulsive decision and she kind of "winged" it. Maybe she didn't announce it to anyone because she felt they might judge her for vacationing in FL during COVID. Who knows?
Once there, perhaps they came into contact with a bad actor, just by going out in public and doing things. This person abducted her but chose not to hurt her son so just left him out of the car in a place he would likely soon be found. This is all just IMO and supposition.