When Griswald asks for Maggie's help to investigate a burglary, she jumps at the chance to do something that won’t involve breaking any laws (spoiler laws are broken).
When Griswald is incapacitated it’s up to Maggie to figure out who stole the loot and retrieve it so that they can claim the finder’s fee.
There’s just three
1) Someone else is working the case and they are ruthless.
2) She's in danger of being caught breaking a law or two.
3) Her family.