My little girl is 21 months, I use Calcough and I do actually see it helps when I use it l. I’ve used others before and they’ve had no effect so I would recommend trying Calcough x
I also have been using calcough, it’s definitely been making a difference
Try warming up some honey and giving her a couple of spoons, it really helps soothe their throats and you can give it as often as they need as well. Obviously limit if you can because of the sugar, but I genuinely find it works just as well as, if not better than most cough medicines that they're allowed to take at this age which are just sugar free syrpus anyway