Six days is so early in recovery.  Harley just had MAJOR  surgery and, while healing from that. Is trying to adjust to three legs.  He's using his different muscles and it can make him sore at first.

As Jerry said, it sounds lvery much like pain signs.  All the strong hospital meds are out of her system.  She's  a smart girl to jist wamt yo resr, rest, rest.  She should only have potty breaks and then back to rest.  No running,  no jumping,  no stairs. Just mthe slightest "over doi g it" this early can cause a lot of strain on her spine, shoulders, neck, etc

You can talk with your Vet about tweaking  her pajn meds.  You always  want to have the meds staggered  so the pain can never get a head start.  The Tramadol  and Gabapentin  work in  ways that compliment each other. For most dogs, best results are when you give them a couple of hours apart.

How much does she weigh and what is her dose a ount and does schedule .  For example, It may be that she needs a less dose but more frequently.

We are not Bets and not giving  Vet advice.  You can  check out this link to discuss  with your Vet about  pain management . 

Also, try some gentle massage up and down her spine and all around her neck and shoulders.   Does she show any tense spots?  Give her lots of good massages  before she tries to stand and after potty.

We are stro advocates  for a visit to a Rehabilitation  Specialist  after she recovers  from surgery.  The Tripawds Foundation   will pay for the first visit.

Update when you can.  Recovery  is no picnic for a couple  of weeks, but it doesn't blast forever!

Hugs

Sally and Alumni Happy Hannah and Merry Myrtle and Frankie too!