Emily Watts' parents, Nicky and Dominic, along with her 27-year-old brother Rory, have all travelled to the hospital in Annecy where she is being treated.
It took several days for French authorities to notify her parents because she was not wearing any form of identification.
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White House budget officials outlined the information during a telephone call with reporters given on condition of anonymity.
A prison officer is to be charged with gross negligence manslaughter and misconduct in public office in relation to the death of an inmate.
The 2017 Oscars will be remembered as the year the wrong film got the best picture award, but it wasn't the first memorable mix-up.