Don't worry too much about it once you're in. There's a fat WRAF Sqn Ldr that got promoted and she's been medically unfit (i.e. too fat) to take the test ever since she failed in in the late nineties. Very little point having the 'test' if you don't need to take it. I'm sure the fact that her Father was a heroic Harrier pilot has absolutely nothing to do with it.
She certainly wouldn't be able to get into a Harrier without a crowbar!