I appreciate any expert advice you can offer.
I am so sorry about Layla and her knee! My Alvy ruptured BOTH of her CCL's before she was 1 year old-you can imagine how much fun that was, trying to keep all that puppy energy calm and rested while she was recovering from 2 knee surgeries-ugh.
Most dog's do NOT lick their feet simply from boredom.
If it is truly a boredom issue, and we can't run the heck out of her to get all that pent up energy worked out of her, then unfortunately we may have to resort to using the e-collar or cone of shame until this period of confinement is over. Kong toys stuffed with goodies or other toys to keep your pet occupied can be helpful. Tranquilizing or sedating medications may be helpful, as may products like DAP collars (pheremones) or "Thundershirts" to decrease anxiety.
Good luck with Layla. Don't worry, Marvin and the Got Sit classes will be waiting for you both when she is all recovered-Alvy and I are good examples of that!
Let me know if you have any further questions or need any help with her.