I know it's very difficult but her patellas are something that will only get worse with age, as the soft tissues loosen [muscles, tendons and ligaments] then it will cause her more pain and problems, in addition she will be more prone to arthritis - which is not comfortable [I can tell you that from personal experience
].
We will be thinking of you Brian - get some Dr Bach Rescue Remedy from the chemist, put 4 drops in a glass of water and keep sipping that - it will keep you calm which will transmit to Rosie too [you can give her 2-3 drops in the mouth - carefully - too if she's stressed.]
I am assuming from that they are are going to both deepen the groove and regraft the ligaments?
When you get her home, keep her warm and quiet - ideally away from the others if they are bothering her. Offer her a small meal of something easily digested but don't worry if she doesn't want to eat - I'm not sure if she is stopping in for a few days or coming straight home?
There's very good info about patella surgery here [gory warning]
http://www.acvs.org/AnimalOwners/HealthConditions/SmallAnimalTopics/MedialPatellarLuxations/
Including:
Post-Operative Care
The surgeon that has operated on your pet will best be able to advise you and establish a personalized post-operative treatment plan. For example, pain medications may be prescribed for a week after surgery. Physical therapy, with compresses and gentle, passive flexion and extension of the knee, may be recommended shortly after surgery. Exercise is typically limited to leash walks for 6 to 14 weeks depending on the procedures performed and factors affecting the healing capacities of your pet.
The surgeon should give you the most up to date advice about post op care - you are sensible to have crates set up and I hope you have acclimatised her to them?
I was sent this:
Deliver pain medication provided by your veterinarian. Post-operative care often requires giving your dog anti-inflammatory drugs to reduce pain and swelling. Medication will make your dog more comfortable and promote faster healing. Check with your veterinarian before you administer any pain medication.
Keep your dog from disturbing the surgical site. The incision site will heal much more slowly if your dog is constantly licking it. Most recommend using an Elizabethan collar or a cervical collar to keep the dog from reaching the affected area. For some dogs, spraying bitter apple near the incision is effective, though others will ignore the bad taste.
Restrict activity for up to 16 weeks. Jumping, climbing, running, or other stressful activities may cause the dog to heal more slowly and to experience unnecessary pain. Once the incision site has healed and the dog is putting weight on the affected leg, walk it on a leash to increase strength and mobility. Do not allow the dog to run freely until after full recovery.
Provide low or no-impact physical therapies if your veterinarian agrees. The American College of Veterinary Surgeons says your veterinarian may advise you to apply compresses and conduct passive therapies like moving the knee back and forth slowly several times each day. Swimming is good exercise since it puts little if any stress on the healing joints.
Install assistive devices to keep your dog from stressing its knees. During and after recovery, put stairs and ramps in place to help your dog get up and down off of couches, beds, and porches. Since patella luxation can recur after surgery, make sure your dog has few chances to stress or injure its legs.
VERY IMPORTANT:
Control your dog's weight. Fit and trim dogs will have fewer problems with luxating patellas and are more likely to recover from surgery quicker.
They should be able to advise you if they think hydrotherapy would help Rosie, and of the nearest centre, although you can also google for that. I think she's insured - and that should cover a certain number of sessions.