Lost weight?

Today's weight: 1.40

Poochie lost her weight slightly. I am worried because she should be gaining weight since she is a young rabbit and considering she has parasites.

She is eating fine but a little less hay.
I gave her a little bit of oats and tiny amount of banana. She likes them.
We don't have any good vegetables now, I tried to give her carrot but she did not like it at all.
She ate a little bit of Napa cabbage too and she was OK with it.

This morning, I brought her feces to vet but I was told that it can be done next week when we visit to checkup on her skin. They did not take the poops I collected... When I asked last time, they said that I can bring feces in 10 days..