What does "rule-follower" mean?

Someone who strictly follows established rules and regulations.

Rule-follower

noun, slang

noun, slang ·Uncommon ·College level

Noun

1
Someone who strictly follows established rules and regulations. informal, literally
2
Someone who is overly or excessively servile or obsequious. derogatory, figuratively, informal

"Layla was a rule-follower and a good student."