Eczema Treatment Care

OKplease read the whole thing. so my daughter (she’s 11)has this 3 year old Siamese tortie cat that she loves more then ever and she is the sweetest and cutest thing to ever walk the planet but she found out she’s allergic to cats. She gets
Atopic Eczema
Itchy Eyes
Watery Eyes (it looks like she’s crying)
Sneezing
Coughing
It’s nothing serious but she also has hayfever in spring summer and badly in the fall and may be lactose intollerant and dust makes he sneeze and get watery and itchy eyes. What are some good medicines for her to take and she is only 11 so she can’t tae adult medicine for 1 more year. I was thinking about eye drops… would they have an effect? I am currently giving her Zyrtec kids and it holds her over for about 2-3 hours but can only take one every 24 hours. Clariten Kids did not work for her. She would be so heart broken and probably would never talk to me again if we got rid of this cat. What are some options?
Thank you for reading it all!