Will try and find a norrower bench and a little higher.
Progress to doing like a reverse crunch ie: dropping the head and feet down as far as possible with out the weights sliding off, and then lifting up as high as possible and holding.
Sort of like a reverse hyper type thing.
She is up for trying anything really that will make her better.
as for some plan, just seen an olympic lifter doing them and thought, hey he reckons it helps so i'll get her to have a go.