[Chi]

I would do like Lawtan said see if you can report her or something.
Unless they have all the facts like your medical history, I don't believe she's allowed to make a judgement like that.
You can't claim someone is capable of anything from how they look, you have no idea what could be going on underneath.
A friend of mine has a handicap license plate because of her weakened immune system, but on the outside she looks "healthy" so people always shoot her dirty looks. :/
I would ask for a different worker from the agency and file a compliant.