Missing Black Cat

Beowulfe got outside yesterday morning and hasn't returned. She has been an inside cat for the past 5-6 years but apparently has been feeling the call of the wild and kept sneaking out. She is 12 years old and is a little on the chubby side. No collar or chip but is spayed. Very friendly. No human are strangers to her. She was last seen around Pawnee and Hillside. I have already put out a Pawboost alert for her, and my sister (the actual owner) posted on Facebook. EDIT: Beowulfe has returned! I heard her meowing on the back porch and let her in. She is skinnier but seems otherwise fine.