Any idea on a breed or breed mix? Sometimes that gives clues to behavior.

What kind of things do interest her? Does she like to chew? Or get interested in things that make noise?

If she's not being destructive when she's inside "acting bored" then I wouldn't worry about it - she obviously likes being inside with you, seeing how the "living outside" experiment went.

If your yard is fenced, or she's hooked up to a run or something that will keep her secure, I don't see a problem with putting her outside for a half hour "potty break" if that's what it takes to keep her housebroken.