Girlfriend got possession with Intent class c felony what is likely outcome if she had no priors?

There are a lot of factors that make up the outcome of this type arrest. Most states have a mandatory minimum for intent to distribute, so the "no priors" is not going to carry much weight. What was the drug? How large was the quantity? Where they in a school zone? Was there a weapon involved at the time of arrest?

Depending on the state where she was charged, the sentencing guidelines will vary - a typical statute reads:

Distribution or possession with intent to distribute class C in xyz state is a felony, and  carries the following potential penalties: 

• 5 years in state prison

• $5,000 fine