Diarrhoea can be caused by a few things other than worms, if she is otherwise bright and keen to eat and drink, I don't think we are talking an emergency. So yes, if you can get an individual fecal sample from her tested that would at least rule something out. Also I would take her temperature, if she isn't cudding she may feel a bit cold - a rug/coat will often cheer them up.
My goats get a "24 to 48 hour bug" every so often, usually in spring and then again in autumn, seems to be viral (according to my vet), and moves round the shed... but with that the first one or two can be quite ill (no appetite, not even for hay, but usually will eat fresh greens, esp willow, no temperature), but within a wek or so they are back to normal.
I normally drench with an electrolyte solution, there will be recipes on Google, but a mix of warm water (or camomile tea) with some salt and honey (not refined sugar) will "help flushing their system". I have a pack of Effydral normally, they are dry tablets and last forever. Just dissolve them in a litre of lukewarm water, then drench.