The 69-year-old woman was originally held following the suspected murder of Karen Carter, 65, in the south western village of Trémolat, in the Dordogne region, east of Bordeaux.
Tamilore Odunsi, 23, was found dead in her student apartment in Houston, Texas, after a friend of her father called them police to say they had not been able to reach her.
A British tourist who was facing jail in the US over a wrong-way crash which critically injured two children has walked free from court - infuriating the family injured in the smash.
The body of Karen Carter, a 65-year-old married mother of four, was found outside a property she ran in the village of Trémolat, east of Bordeaux, on Tuesday evening.
The driver's face was said to have been 'completely shattered' in the altercation, and his unconscious body left at the roadside until a fellow cabbie found him.
Power supply was gradually restored from late Monday afternoon and early evening though some operations were still not able to resume on Tuesday morning