In case you don't find a French prepaid with English voice prompts here is the guide to mobicarte (see other thread).
http://sites.orange.fr/ge/content/pd...e_06_07_06.pdf (PDF)
Of the 56 pages one, (p45) is in English. But it's enough to get it working.
I'm not recommending mobicarte - it's just the only one I've looked at in any detail. The card and the credits are widely available - certainly, I should think, in somewhere like Nice. As said elsewhere, your daughter will need a French address - such as a hotel.
If she needs to activate an option, which usually needs a call to the helpdesk, I suggest she gets a French-speaker to do it for her.
Other SIMs may have better rates to the US or whatever you need.
Dave