Learn English – Word that describes experiencing something second-hand

You can say she is a very well-disciplined student. CED suggests that it has the meaning:

having been strictly trained or conditioned to ensure good behaviour, orderliness, etc

Or you can simply call her a model student.

If you want to describe a righteous person, you can use the word

virtuous

having or showing high moral standards.

or maybe you just want to describe a person who's quiet and obeys all the rules, in other words,

biddable

meekly ready to accept and follow instructions.

The best I can come up with is that your friend is

Milking it for all it's worth