welcome here! is she eating veggies now? you said you gave parsley too young, but she should be old enough to handle it now.
you can give her regular food pellets as treats for the clicker training. just hold it in your fingers and it will work the same way. remember that a treat can be anything they like that you feed by hand. another thing i did when i was clicker training (which i want to start again… i took a two month break to bond my bunnies) was i bought matchstick carrots, the itty bitty sliver ones, and cut them up into tinier pieces. each matchstick carrot can be cut into 4 or 5 bite-size pieces. i used raisins also, and i cut the raisin into 2 or 3 pieces. what you want is for the treat to be a one-bite item. so it has to be impossibly small. this will also stretch out the treats so they last longer and your bun does not get too many. i would not give any treats at any other time except when you are training, since it is possible to overfeed them.
keep away from petstore treats. seed items, yogurt drops, and processed cookies are not healthy. natural fruits and veggies are better.