If your friend travels under the Visa Waiver Program, it is very likely that she will be denied admission at the airport and returned to France.
As for your second question and what she can do now, it all depends on why she was refused a visa. Presuming that the embassy assumed that she was either going to work in the US or that she would not return at the end of her trip, it can be very, very difficult to overcome such a presumption. Her best bet may be to apply for a work visa, such as an H-1B visa or an L-1 visa.
If she’d like to further discuss her case with me, she can contact my office directly to arrange for a consultation either over the phone or in person during my next trip to Paris in October.
Edward Weiner
Attorney at Law
E-mail: E.Weiner@immigration-aux-usa.com
Internet Site:
http://www.immigration-aux-usa.com/