I was in the same exact boat. I got my Duchess from a woman who had a 1 yr old child, worked full-time and went to school part time. She had Duchess before all of these changes. Duchess is now 3.5 yrs old. She told me that Duchess was spending as much as 16 hours a day alone and she felt it wasn't fair to Duchess. She would leave around 7 in the morning and wouldn't return until sometimes as late as 10:00 at night.
She loved Dutch very much as she was very well taken care of. In fact she texted several times to check on Dutch. For the first few months I also felt Dutch was depressed. At 3 yrs old she is still very playful and puppy like. Since I am single and live alone, there isn't much excitement going on in my house. I briefly fostered a kitten and Dutch lit up like a christmas tree. She was so happy to have a playmate. I found the kitten a home but if the lady had changed her mind, I would of keep the kitten. The kitten and Dutch had bonded and had reached a point that they were doing everything together even sleeping together. I wished I would of kept her because Dutch had a best friend.
When the kitten was gone, Dutch went back to being not depressed but not really excited about anything except going out for long walks. Who can blame her, there was nothing in the house to get excited over. Because of this, no matter how tired I am when I get home from work, playtime is mandatory. We go for long walks and training sessions or games at home. She goes crazy over our game of hide and seek that we play everyday. It is up to me to try and figure out what excites her and then try to provide it to her.
Your little one came from a busy household. I'm not sure what your household is like but if is like mine she could be bored. I knew Dutch was bored and not depressed because of how she got excited over certain things. Also not sure how long you had her, it could be she just needs time to adjus
Here are a few items on how to relieve boredom
Quick Ways To Relieve Dog Boredom - Crafty Petz Blog