Well, being a mom to a 20 months old dog, I'll say my experience was: dog crating, grandmasitting (which we still do) and energy spending does quite well. We also chose a lower energy puppy (he would play a little and go to sleep while his litter mates were still playing and nagging around), which it seems you also got. Observe her for a few extra days. If she isn't okay for now, you can do several things:
1. Get the $180 mo walker.
2. Get a walker 3x week only, instead of every day (if she's okay on her own once in a while)
3. Environment enrichment can go a long way if your kennel is larger than a crate. You won't want to enrich it too much so the dog will be busy all day (sleeping is always encouraged), but maybe change the toys every other day, hide a little gift here and there (like a toy or treat), change the bed place, get her something with the smell of outside. There are easy to do and can keep her distracted for the few hours when she's awake and you're away.
Honestly, you got lucky with your dog, for your current situation. :) Enjoy her! And if you pay the dog walker, make sure you'll only need it for a couple, or maximum 4 months. Reevaluate every month (or even every week), and flex the frugality muscles!
Also, kudos on the webcam. I wish I had thought of that! I only used it to teach the dog not to climb on the sofa when we weren't looking. Wish I had thought of it earlier. :)