Honestly, worms are usually associated with green frothy droppings rather than orange. I see orange more in birds with coccidiosis.
However, there are more things to rule out. I'd check her very carefully to rule out mites as there are problems with them right now especially. Check her skin carefully, especially around the vent. While you're there, make sure you don't see any white or black waxy stuff on her vent. Also check for any droppings clinging to her vent, any sores, etc. See whether or not her crop is empty.
I'd give her probiotics for two weeks regardless because of her instability. I'd rule out mites, treat for them if she does have them.
If you worm, here's the safest way to do it if you have an established flock.
Worm first with a gentle less broad spectrum wormer. My choice is Wazine because it's only effective against roundworms which are the most prolific worm in the barnyard. It usually requires 2-3 treatments, which is good believe it or not. Treating too heavily first round can shock a bird into death. So treat gently first - Wazine 17% (piperazine 17%) - not the dog or cat kind. It's a one day treatment, inexpensive, very readily available.
Two weeks withdrawal on eggs and meat. Then you retreat with the strong broad-spectrum wormer. My preference here is drop-on ivermectin. That way each bird is wormed for sure (unlike drinking applications) and you also treat for mites at the same time. It only takes 1-5 drops per bird depending on the bird, and there's no withdrawal on eggs. After the initial wazine/ivermectin treatment, I only worm twice a year with ivermectin. You can use other more natural preventatives inbetween if you'd like.
In the mean time, I'd check more carefully and tell us what percentage of her droppings are orange, how many ar emore normal, and if you're seeing any green running (frothy) droppings.
You'll want to nourish her - give her egg yolks (boiled/mashed), a little yogurt, some karo or honey, and pellets. You can mix applesauce in that to make it more tasty to her. Yogurt will replace bacteria and give protein, honey or karo will boost her energy, applesauce cleanses the guts and tempts the bird to eat, pellets or her crumbles dissolve easily in her stressed system.
