This was a wonderfully sweet story, but it could use a few pointers.

Whenever someone else speaks, there can be a separate paragraph for that bit of dialogue. For example:

"Yes I do but.." "But what?" Carrie bit her lip. "He's going to trick me I know it." Bella smiled and pulled a strand of Carrie's hair behind her ear. "Care Tommy is really nice and so is Sue their just trying to help you out okay?"

It can be:

"Yes, I do, but..."

"But what?"

Carrie bit her lip. "He's going to trick me, I know it."

Bella smiled, and pulled a strand of Carrie's hair behind her ear. "Care, Tommy is really nice, and so is Sue. They're just trying to help you out okay?"

Follow that piece of advice, and the grammer will be cleaner.

Forgive me if I sound like a smart-aleck, but that's what I think. Like I said, this is a wonderful, and sweet little story! Keep writing.