Congratulations!! I am so happy for you. I've been thinking about you all day wondering if you decided to go back and get your little girl. It's so great that you were able to find a baby that you are more comfortable with. Like everyone has mentioned, give her some time to adjust to her new surroundings. I'd also hold off on changing her diet until she's had a chance to settle in.
I can't wait to see pictures! BTW, Tia is an adorable name!