I don't think it's abnormal -as such...
Many dogs won't necessarily want to drink unless something triggers them to need a drink (such as they have been playing or wakling -impossible when recovering from a major surgery! Or eating.)
It takes a day maybe for a dog to feel recovered from the surgery and go back to their normal routines.
Also it's likely she was given fluids by IV when in the vet's (you can check that by calling them if you like.)
BUT it's quite important if you can step in here and make sure she does get some hydration. It might not be that difficult to do.
If you can stew up some tasty meat in some water, maybe with a few vegetables suitable for dogs. Something like carrots or greens. Let it cook, then strain off the juices. When that has cooled, offer her some. Just a little, in a dish. She might well lap that up because it will smell so good. She will most likely be starting to feel hungry again now, after a long fast. If she is hungry she will welcome the taste of the juice. If she drinks it give her some more. You can always give her the meat and vegetables after you know she's had some fluids.
If she still refuses to drink, then get a syringe (without a needle! Most pharmacies will sell packs of them,) and gently, a few drops at a time, syringe liquids into the corner of her mouth. A good place to syringe the liquid is between the large back molars and the front teeth, where there is a natural 'dip' in a dog's teeth.
Not too much liquid at a time. You don't want her to aspirate the liquid! Give her time to swallow one lot before you do another.
A syringe doesn't hold a lot of liquid so you will have to do this frequently until she starts to take on fluids herself.
I wish her well with her recovery.