I feel the need to calculate this...

250,000 EQM is 500 flight hours.

At 35,000 feet, you're sucking up about 5 microSieverts per hour (thanks, cosmic rays!), so we're talking 2.5 milliSieverts over the course of the year.

Actually that's not too bad, the average dose for Americans is 6.2 mSV/annum anyway so she hasn't actually sucked up all that much more radiation than normal.

Good stuff, I'm no longer concerned.