My 15 year old border collie (Sasha) gets up and wanders a bit each night too. I chalk it up to her arthritis and that she needs to get up and move every once in a while.

Although I am also concerned she's a little "out there" some days when she just stands staring off into the distance at nothing.

As your vet said, and others here, don't panic. Is she on any meds that might be upsetting her tummy? Sasha is so she gets not one but two different tummy soothing meds each day.

Take it one day at a time. It's tough with senior doggers for sure.