I feel your anxiety - I am always on tenterhooks until I know they are safely through the op and anaesthetic - but anaesthetics are so much safer these days and vets better equipped, and I am sure all will be well.
Expect her to be sleepy and even wobbly at first, and she might whimper while she is snoozing. A sore throat from intubation is common, with a bit of coughing and wheezing. It can sometimes take a while for them to pee, and even longer to poo, so don't worry if she does not do so immediately. Your vet may give you a bland food for the first few days - if they don't it might be a good idea to buy some or cook your own - chicken and rice or something similar. The vet should certainly provide you with pain relief for her - make sure you understand the dosage and when to start it - she will be dosed up during and immediately after the op, so more may not be needed for 24 hours or so. Most important of all call your vet if you have any concerns or if things don't seem right to you - mine always emphasise that they would far rather owners called too often than waited until things had got serious, as they very occasionally do.
If she is not happy to sleep in her crate at night lifting her up onto the bed and wrapping her leash around your wrist to make sure she cannot attempt to jump down is an option. In fact keeping her leashed in the house when she is not in a crate or pen is a good way of keeping her from jumping or running up and down the stairs - in a few days she will want to run and play as usual and then life can get complicated!
