Lisinopril Ace Inhibitor, Allergic Reactions, African Americans, Medication, Mom

My mom just passed away 2 months ago from taking this ace inhibitor and she had been on the medication for years. The explanation we received is that "in African Americans, we are proned to have allergic reactions while on this medication and it could happen at anytime...even if you took the medication for 10 years, u could just all of a sudden have a reaction." My mom took it at least since 2004, I seen an old prescription bottle while cleaning her house. I am very torn about what i should do. I cant bring my mom back and I miss her dearly. Is there something I can do about this? Contact the makers? Who are they? Warn others? My mom was only 57 and if I can help someone else, then that could also help me heal.