she can have a veggie now. usually at about 3 months actually. start off with something simple like a dark green lettuce or herb like parsley or cilantro. try to give it everyday for a week, and then each week or every other week adding a new one. it’s recommended that they get about 2 cups of fresh veggies a day… you can start out less than that and work your way up as you add more and mroe veggies. eventually you’ll wan ther eating at least 3 or 4 different veggies a day to add up to 2 cups. some veggies you need to be mroe careful with than others b/c they may cause gas or are too high in calcium.
here’s the Binky Bunny veggie list… https://binkybunny.com/Default.aspx?tabid=144
and the HRS veggie list… http://www.rabbit.org/care/veggies.html
i’d suggest printing out a copy and taking it with you to the store. i know if i don’t have a list i tend to forget things easily. you might also want to check it off if you try a veggie and he likes it so you’ll remember next time.
edited to add: on a related note, as she gets older and is getting mroe veggies, you will be able to decrease her pellets (timothy pellets if you’re not feeding them already) to betw/ 1/4 and 1/2 a cup a day depending on her weight. ask your vet for their opinion on this too, of course.