The same reason she would use gaps to steal sake when she could go gap to wherever it was bottled/being stored.
The same reason she would live in a very modest home when she has the power to overtake any domain she wants, or gap in the pandaemonium fortress from Makai (assuming it's not completely wrecked)
The same reason she would allow a ghost princess that she resurrected to steal the spring to resurrect her own dead body when it was Yukari who made her a ghost princess in the first place.
We're talking about Yukari here.
If you had to play the same game for thousands of years with what equivalates to console commands enabled, it wouldn't take you long to abandon all reason, impose artificial limits for yourself, and try to create conflict that you can watch play out for entertainment.