I remember Brusselsprouts for sure being high infibre, and I think brocoli and cauliflower, but I'll have to checkthose. As Angieluv said, introduce them slowly, don't feedthem for long stretches (rotate the veggies) and esp. with the above,watch for potential gas reactions.
Noprmally I'd say ifyour bun isn't overweight and seriouslyseems to need the roughage (ie: small, shrivelled poops most of thetime), then a teaspoon or two of daily pumpkin won't hurt, but not sureif this is the case with soft stools.
And the highest fibre pellets I've found are the Oxbow Bunny Basics T. They are quite a bit higher in fibre.
PS: You may tryspraying somehay with just a little apple juice.
PPS: Again as Angie said, try experimenting with types of hays andgrasses, maybe you'll find one she likes. There's adifference between first and second cut Timothy, and tons of differentbrands and grasses out there. Timmys is best, orchard isgood, too, just a little richer, etc, etc... Here'sa good link for more info.
http://carrotcafe.com/f/hay.html
SAS