They are very different names. Sophia is grown up and with a long rich history, Daisy is a cutesy flower name that also used to be a nn for Margaret.
I think Daisy is naff on an adult, so would try and pick a slightly more sophisticated flower name like Jasmine or Iris. Sophia I think is lovely, but if it’s popularity puts you off then perhaps something with a similar feel like Serena or Seraphina.