M.,
I suspect that her allergies are NOT under control. I also have allergies, and the itching in the nose can be overwhelmingly intolerable! Medications that "dry up" allergies often make it worse.
What you do to address the allergy issues of course depends upon the specifics of what she reacts to, but some things (like a HEPA) air filter, are a must. Some doctors are great at giving instructions, others are NOT. Start researching to see what can be done.
In the meantime, I do get great relief from steaming. I am able to do this with a bowl of steaming hot water that I "tent" with a large towel. For a 4-year-old, I'd suggest trying one of those facial steamers, if you find one that seems to be safe. Otherwise, daily baths/showers, perhaps adding in vapor products with eucalyptus or Vicks, if she doesn't react to those.
Incidentally, I was able to almost eliminate my allergy symptoms by adjusting my diet to be much higher in Omega 3 and lower in Omega 6 than it was before. This is because Omega 3 tends to be anti-inflammatory (allergies are inflammatory), and Omega 6 tends to increase inflammatory reactions. This can be researched online. For a quick start, you can begin giving her only fresh foods- nothing preserved. Include some of these foods: tuna, salmon, halibut, herring (not many 4 year olds eat this one). There are some liquid supplements that can be put into milk shakes. There are prescriptions, but if her pediatrician is not into integrative medicine, good luck! lol You may need to research regarding the appropriate amount if you cannot find one made for children.
Take it from an allergy sufferer, when it was bad, I would have scratched my nose right off my face if only that would have made the itching stop. Deal with that first, obviously telling her about kleenex isn't doing it!
Best wishes,
J.