There was nobody she could talk to.
Doctor Hopper was a decent enough shrink for a cricket, but it's hard to make progress in therapy when your therapist can never remember the breakthroughs you've made... When every appointment is your first appointment.
So Regina stopped seeing him. Sometimes she thought that Pongo might be aware of the rewind-and-do-the-day-again thing, but that was almost certainly wishful thinking. Every few weeks she would dog-nap Pongo and take him for a walk. She would feed him elaborate dinners and spoil him, and it was wonderful fun.
Doctor Hopper never realized what was going on because the day kept resetting, year after year. Pongo had stopped fussing when she snatched him away many years ago. Sometimes Pongo would be waiting at the window, nose on the sill, and wag his tail when she would walk by.
Alright, so maybe there was somebody to talk to.