Leave it as a large area - if she develops the habit of sleeping in a non-wee spot, all the better. (If you can find a cover for it, that will make it even cosier. Don't forget to treat her whenever she pays it a visit.
It will make it easier for her to learn not to wee at all when she gets bigger, and better bladder control.
With regard to the weeing, remember to be OTT when praising her for toileting outdoors. Very important for dogs that are anxious, so they develop positives associated with toileting outdoors, and eventually this turns into the only place they want to go.
With my middle dog (slow to TT overnight), I rotated 3 large, old towels through her crate - one soaking in Napisan, one in the wash, and one as her bed. It may encourage her to be clean over night, as she's starting from a clean base.
When you start with the crate, remember to do lots of pits stops for the first few weeks. So, a very late one, a couple through the night, and an very early one. When she achieves 'dry' overnight, its time to drop one of the overnighters.
Also, limit water after 9:00pm. Make sure you're setting her up to win lots of praise, rather than setting her up to wee.
good luck - if you have any questions, happy to answer them.