If she's truly a trash hound, I would definitely look into a grazing muzzle (to prevent her from scarfing up everything in her path) when she is outside.
These objects that she is eating could easily cause an intestinal obstruction so do take this seriously.
I would also see the vet to discuss reflux disease and see if he wants to start her on an antacid like tagamet.
Let me know if you have more questions!