she should be fine with 1/4 cup. that will probably make her eat more hay, which is a good thing! the pellets are only supposed ot make up a tiny fraction of her diet.
i’ve heard primarily: pellets= 5% veggies= 15% hay=80%
if her wieght has evened out, that’s good. start cutting back the pellets. each week give her a bit less until she is down to the 1/4 cup, it’s better if you do it gradually. house rabbits are very prone to obesity, and i *think* that risk rises after spaying… (that’s the only risk i believe… someone correct me if i’m wrong.)
as long as you are keeping with the guidelines in the veggies lists, she should be fine. most of the veggies are very good, but experiment with some different ones to see what she likes. the dark lettuces are favorites as well as herbs and greens (collard, dandelion). the other “weird” ones sometimes don’t go over as well (like bok choy, chard and kale… at least with my buns!) the pellets will fill in any nutritional gaps that are left from the veggies.
you really do not need to worry as long as you are following the guidelines.