The thing is, Sabrina is pretty much created to be a fairy godmother and make not just Homura's wish come true, but in a sense nearly every magical girl's wish- because they made a wish out of a desire to be happy, and Sabrina wants them to be happy.
This is actually a mind-bogglingly effective tactic if Sabrina is actually playing into someone's wish to be happy because it lends the weight of their wish to much of what she does. If you're working to save Madoka, Homura's wish probably helps. If you're working to bring people together, Mami's wish probably helps. If you're working to help Oriko, Kirika's wish probably helps. And so forth.
It's kind of potentially a wish avalanche once it gets going.
This is actually a mind-bogglingly effective tactic if Sabrina is actually playing into someone's wish to be happy because it lends the weight of their wish to much of what she does. If you're working to save Madoka, Homura's wish probably helps. If you're working to bring people together, Mami's wish probably helps. If you're working to help Oriko, Kirika's wish probably helps. And so forth.
It's kind of potentially a wish avalanche once it gets going.