Honey08
Waffled a lot!
I would use something such as a homemade version of the Haygain Forager. I have run rehab yards for many years, and have lost count of the number of horses I have had in that need restricted forage, but also have chronic ulcers so need ad lib forage (I also have a very strict rule of all horses on my yard having access to forage at ALL times, so needed to work it out!). We have made our own slow feeders using a wooden box with slow feed haynets and caribiner clips. This way horses aren't damaging their backs and necks and TMJs eating from haynets, but they are slowed down.
I would feed her soaked hay mixed with straw, and offer it in this sort of form. It will need to be weighed, and I would recommend getting your hay analysed to ensure she's getting what she needs from it.
Could you possibly post a picture- I can’t quite imagine it.