Switch the bed and the litterbox! They usually stick to one corner for their "business"

digxmexnow’s suggestion fo change the location is right on. Another thing too is that bunnies like to eat while they poo, so actually having the hay in there will encourage that pooing/eating behavior. Can you use another material for her bedding? What about fleese or some soft blanket? Some bunnies will still mark their blanket to claim it though so it’s a good idea to have a few so you can replace while washing.

If you find your bunny ends up trying to eat the bunny blanket/cloth then you’d have to find something else.

Also, each time you clean the litterbox, leave/add a few poos and a tiny bit of urine in there, so she’ll continue to get the idea that it’s the litterbox, not the bed.

They’ll eat the hay no matter where you put it! Haha

Personally, for my bun, I use a small cat-sized litterbox and fill the front half with hay and leave the back half for him to do his "business" in. It is a good way to reinforce litterbox habits while also making a bit less of a mess!

basically if a bunny keeps going potty in a spot, you want to move a litterbox there.

it’s not wrong to have hay in a bunny bed – but it may be confusing her. many of us put hay in the box to encourage bunny to use the box and eat hay. I understand you can’t swap the bed for a litterbox since you’re using it to block off the area- but perhaps you could buy a larger / taller litterbox to block the area?