I think we all think that we got in over our heads after we've had our baby(s) for a few days! I know I did! I had 1 yorkie when I was with my ex, so 2 people 1 yorkie and it was fine. We broke up and sadly the pup died. I got my own place and then got 2 boys, so now Im 1 person, 2 dogs! YIKES! No matter how much planning and thought I put into the decision to get them, after about 4 days with them, I was overwhelmed too!
You will do GREAT and you will be fine with her! You didnt make the decision lightly
At first it seems like A LOT, overwhelming almost, but after awhile it becomes a routine that will work for you both. My boys are 2.5 years old now! The nervousness I had is gone!
Keep asking your questions here, get some books to read, consult your vet and just keep loving her and being patient with her!
It will all work out!