My Wife Has Been Taking Lisinopril For 7 Years. She

My wife has been taking lisinopril for 7 years. She took two aspirin and had a life threatening allergic reaction.
I took her to the emergency. They gave her epipen and benadryl and put her on IV and oxygen. After 6 hours they let her go home. The next morning she had the same reaction and found herself back in the emergency. Is this going to be a re-occurance and if so for how long?