Underweight bunny

So, we had Flossy our white Cashmire bunny for a good few months now, just after christmas I think. She's gotten very skinny, she weighs 1.8kg, We're not sure how old she is as they didn't even know what sex she was.

Should I take her to the vets - she doesn't appear to be ill, she hops about happily but as we all know, they don't like us to know.

What do you guys think? She's quiet small...

She loves her food. She's not anorexic

Our Lilly eats buckets full (twice what Ron eats) but with her being a poorly bun she is always skinny as her body doesn't absorb the nutrients.
Wonder if she is hiding an illness?

Could be i'll get her to the vets tomorrow.

If you're worried enough to post here, I think you should get her checked out. She might not be noticeably ill now, but it is a good idea to see that nothing bad is brewing.

How did you get on at the vets?