Thanks Lyn! It's good to know that it might be a while yet... according to my old calculations she'll be 8 months POS on the 11th or according to my new calculations she'll be 5 months on the 19th. Either way we have to be getting close to an end... don't we?
Here's a shedding pic I took towards the end: her tail is still inside the shed at the back:
And this was taken a few minutes ago after she ate her little 40g post-shed rat.

Since January she's lost about 100g. So I guess it's a good thing she's still been eating small rats throughout the gestation time. (Although this is often an indication that she's carrying mostly slugs).
I've started adding Vitamin B and calcium to the rats as an extra boost.
Hopefully she won't be in too bad of shape when this is all over!