My 4 yr old tabby?

i have 2 cats daisie who is a 4 yr old tabby and malcolm a 2 yr old domestic who is an abused rescue cat i got 3 months ago, daisie lately has been hissing and growling at me, i have not been bothering malcolm because he has been abused and is very skittish, so i dont understand why daisie is so angry at me, i love her so much and im very hurt by this, what can i do to get her to stop being so mean to me??