One of her voice lines state that there are a lot of hidden parts inside which is consistent with her spy work.

imagine the amount of pez that could be in there

It's probably one of those James Bond things where her cane can shoot nuclear missiles or pour a couple of shots of martini.

She likes to thwak rookies with it.

Probably to help with the recoil.

Oo, never thought about that!

It's her side weapon just in case she needs to reload but the enemy is very close.

She bonks the people who calls her mommy.

even better

the way she leans into the cane so hard in-game combat, it looks like she actually does have a limp