I see what you're saying, but a medical degree is like any study -- through the miracle of revision, it's possible to pick up where you left off. I once knew a medical student who deferred her studies to go backpacking for three years -- she had to do some pretty heavy revision when she got back, but after the first few days she found she'd retained most of her knowledge.

And Martha's only been gone four days from the world's perspective -- her supervising doctor is recently dead, the hospital is only just back from the moon, and the Prime Minister has just been killed by his wife, after murdering the president of the USA. So I'm pretty sure she'll get a couple of empty weeks for revision.

*helpful*