Well, if the dealer does the work, expect $200-$500. If you don't drive the thing after the gas gets put in, all they have to do is pull the tank, drain it, flush out the line to the fuel filter and refill, and you can escape for the $200 or so, mostly labor and proper disposal of the waste fuel. Since she drove it, they have to flush out everything, and that's what will cost you.
Yes, you can do it yourself and save, but it is a horrible, messy, and even dangerous job (think fire hazard, and what happens if you have a static discharge at the wrong moment).
For what it is worth, the VW TDI forums deal with engines and fueling systems much more like the CRD than do the Powersrtoke guys. The TDI crowd reports ruined injection pumps with substantially less gas than 50%, but even they get by with no damage with lesser amounts somewhere. Still, safest is to "drop and drain" immediately whenever you discover this mistake has been made.
It is probable, since she only drove it 3 miles, and it only sounded rough, rather than dieing outright, that you'll be ok with the flush and refill. The real damage comes when folks try to keep a rough-running diesel going to burn it off when the percentage gas is fairly high, somewhere between 10% and 30% (and no, I'm not going to attempt to find the real boundary between "no problem" and "melt-down.")
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