If she returns with a red wrist meter, she gets grounded from future missions because of all the accumulated radiation she took over the years. By removing it, she wants to fake the amount of radiation she got exposed to and get back into space again later. However, she's going to be suffering from radiation sickness at best, so she won't be able to hide it. She should be grounded upon return to Earth, or she may choose to die on the Moon
Exactly, she'll have the symptoms anyway. Plus she'll have to make up a ridiculous cover story of amnesia for the French astronaut for anyone to buy it. On top of all of that, everyone is going to have to get tested for radiation poisoning no matter what - purely for scientific reasons. No way she keeps the secret past episode 3 at the latest (if they're sticking to any reasonable level of plausibility).
Plus, wasn't she in the trailer on Earth?
Plus, wasn't she in the trailer on Earth?