Puppy
Puppy
You know I like my coffee sweet in the morning
and I'm crazy about my tea at night
This^
the lab is having separation anxiety, she thinks that since her buddy left and never came back that you might do the same. Is she crated when your not home? Why I ask is because if she is make she to leave something that smells like you for comfort as well as her favorite toy. This is something she will work through in time, just like us they greave too. A puppy would help divert her attention that's for sure, especially a young one she could treat and guide as her very own.
Sorry about your loss Bud trust me when I say your in good company, a lot of us have lost pups here lately.
Maybe try ProQuiet to see if that calms them down a bit.