As an addition to this: I looked up the credits that each AP score brings, at my university. It differs by subject, but for the Spanish exams, a 1 is worth nothing. A 2 carries 0 credits, but permits a student to waive the first year of college Spanish. A 3 also brings 0 credits, but permits a student to waive the first two years of college Spanish.
I think that most schools offer an internal placement test in foreign languages.
Does anyone know if AP retakes are allowed?
I'm assuming she'll take a language placement test at her college. I just don't know if listing a 3 on the common app is worse than not listing it at all