Peeing in one corner?

So I've had her for a few months, and got her a new cage, she's decided she prefers urinating in one specific corner of the cage... instead of the one with her litter tray (which she just seems to sleep in and push all the litter out) - would it be worth putting the tray there where she is peeing?

Deffinitely!
She's being very clean and has allocated that as her toilet area! Clever girl!
My boys decided that they preferred their litter tray (which they used perfectly as a toilet area) as a bed and started to wee beside it. Bunnies are such funny little things

Yes I would move the litter tray to where she wants to go.

mine love to empty out their litter trays! I would move the litter tray into her chosen corner and put some of the soiled bedding in it just to give her a helping hand