I know how demotivating it is to work a dog when you are feeling cr*p. However you do not need to take the dog for walks if you train the retreive. Find a horse supply store and see if they have buggy whips. Tie a piece of sheepskin to the end and drag this in front of the pup. When she catches it, shorten up the line until you can grab the skin and have a game of tug. Remove the skin and throw it away and immediately drag away from dog so the dog has to chase. Repeat
If you get her really tired she will sleep for a couple of hours.
When she wakes up , a kong filled with peanut butter will keep her occupied for a long time.
Tie a piece of bungy chord to a tree or fence and tie a piece of sheepskin to the end. Having taught the pup that sheepskin is nice to play with, she will try and run off with this piece. As it stretches out, she will let go and as it springs back, she has to chase it to catch it again.
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