Did you have reason to be uneasy? Have you had a bad exp in the past? was it just the breed? don't beat yourself up over this, we are all human and make mistakes some mistakes are bigger than others but this isn't a huge thing. You can always go back and fix it. My oldest daughter Jesse has two pitties one I adore and think is the most wonderful baby in the world, her other one makes me uneasy I can't explain it and don't need to. with him it's always a background thought of untrustworthy it's not cause he is a pit it's just an aura he exudes, I have felt the same over other dogs in my 35 yrs around dogs just a feeling. So don't be too hard on yourself, if you want you can take her out next time. Or not.