Hi, YYYY@YYYY Can You Please Tell Me How Long It

Hi, YYYY@YYYY can you please tell me how long it take for Morphine to get out of you system my mom is on 0.25 ML. she has been on it for a while she is on Hospise and is at home. The Dr changed her med to some other med because she has hives all over her body. She has had them for about 1 and a half weeks now. Is true that she can get the hives from being on the Morphine for so long?