> She seems to have a slight difficulty in swallowing
It could be that her throat is dry & sore from the op. I got a 'recovery food pack', for my cat, it was pouches of cat food that was chopped up in very small pieces in a gravy (can't remember the make - it was from the vets).
The calling will stop, and if you hadn't got her spayed it would have got worse & worse & worse (speaking from experience) and it wouldn't have been nice for her or you. :( There is no way I will ever leave it so long (2 years) getting a cat spayed again.
Enjoy your cuddles with her, because before you know it she'll be feeling better and be happily playing with the new kitten when you get it :)