I was thinking on this last night & as its looking likely she has similar problems to my own DD, at least in part - you might want to prepare in advance incase she's ill at all in future -
kids medicines have been a real problem for us & TBH not one we've really solved 100%, which has been awful as there have been times when I'm already dealing with a very sick DD, yet have had no choice but to give her medicines that we know cause other problems for her, because of the preservatives, colourants & sweeteners :(
We did for years have a great old fashioned chemist who knew her problems & automatically mixed up special preparations for her - until he retired I had no idea that, that isn't the norm & most chemist can't do that, many don't know how, turns out, even the ones who can need a specialist licence, which is expensive, so most don't bother -
there is a central place they can be sent off to & come back over night, but it needs a very specific prescription - which is where I've hit a big problem - my GP didn't know what to write on the script & we had hoped the Hospital dietician would be the one to help with instructing her - Dietician did try, but so far just been passed from pillar to post & still not sorted it out
Your best bet is to try & find an older local chemist who CAN mix his own scripts, or post here in your local section & see if you can find one that way, & mention it to the Dietician when you see them, you might have better luck where you are - our Dietician was great in that she understood all the problems caused by these food chemicals, but still couldn't solve that particular problem :(
Now DD is a bit older, under instructions from one great chemist - we can give her normal paracetamol broken up & mixed with honey, but not ibruprofen because of the way the drug is dispersed in the pills might mean an overdose if we break them up - we've also got round some antibiotic needs by the GP prescribing her with adult lower dose capsules, emptying them onto a spoon & again mixing the powder with honey - neat ribena is good to mix with too if your DD wont take honey - it was first developed for medicines apparently.
Also - I'm curious - did you notice your DDs problems start after any antibiotic treatment??? - mine did & I've seen others on here, with this problem say the same -
IF that is the case, you might want to keep an eye on it escalating to other chemical additives & possibly lactose too & causing stomach problems - every time my own DD needed anti B's she developed another intolerance - starting at 10 wks old with certain colourants via my BM aftecting her skin & now includes all chemical additives, MSG, Sweeteners, Benzoate Preservatives, & Chemical colourants - both in food, or soaps etc & affects skin & stomach
thankfully its easily managed once you know - bar medicines & she rarely has skin/stomach flare ups at all, & most supermarkets now are good, Aldi's in particular have versions of most snacks that are additive fee - Azda was pretty good too.
Hope thats of some help - good luck to you & your DD :)