Hello
How old is Meg? If she's only a baby 4 hours is quite a long time to be on her own.
I don't work but if I have to leave them for more than a couple of hour's I tend to take them for a big romp, so they are very tired and sleep while I'm gone.
Would there be a chance you could ask someone else to go in during the day, to play with her, maybe take her out for a walk?
If she is very upset maybe a doggy creche could be considered. Sometime's we forget that they are pack animal's and need to be with someone!