Eczema Treatment Care

it starts around her mouth and spreads to her entire face. It swells to the point that her lips will crack. We apply ice packs and give benadryl but once it starts there is no stopping it. The swelling lasts around two days and the redness will last a week or more. after about three days, any affected skin will begin to peel like a healing sunburn. We have seen three doctors (including an allergist) they say “Contact Dermatitis” but have no idea what the irritant could be. They say to treat her with hydrocortisone cream and cold compresses. Also, to use vaseline on her lips. Maybe someone has had a similar experience or has heard of one and could give me some clues. My daughter is a nail biter, thus making it nearly impossible to pinpoint what exactly could be going into her mouth. I would appreciate any help i can get. I just can’t figure this out.

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!