Hi CaliMom - that definitely sounds like a time for a taxi. I think you know about the fixed rates for the taxis depending whether you are staying on the Left Bank or Right Bank.
She should have a piece of paper with her with the name of the hotel (if there is one), the address, AND THE ARRONDISSEMENT written on it to show the person running the taxi line and to give to the driver. That way there is no confusion on where she needs to go.
The only thing is to tell her to follow the TAXI signs when she comes out after baggage claim (whether she collects baggage or not!). I think they are pretty good these days about keeping OUT the taxi touts from the terminals, but she should NOT go with anyone who approaches her IN the terminal and offers her a taxi. She just needs to FOLLOW THE TAXI SIGNS and get in the official line and all will be fine.
I always count on about two hours from the plane touching down to arriving where I need to be in Paris. It can certainly take less time, but it will be a nice surprise if it does.
Taxis are 53 euros from CDG to the Right Bank
58 euros from CDG to the Left Bank.