She's such a cutie! I have a Yorkie named Lacy. After she's spayed just make sure you keep her still for the whole week after she is spayed. Lacy started being really active again about three days later and tore her stitches inside and had to be restitched up...so then I made sure she wasn't active at all for the week after. She ought to be just fine but it's important to keep them still so they can heal.
Beautiful puppy. I kind of know how you feel, because I'm 14 and my Pomeranian pup is my full responsibility too. He was neutered when I got him though. Just stay positive and make sure she stays calm and quiet when she's home!Good luck.