Snow is still under the effects of the anesthetic and really disoriented. They always try to wander like that, but the stricter the confinement, the better. She might be better kept in her carrier for the next few hours at least, it will force her to sleep it off. Since you can't put the kittens in the carrier with her while she is so confused, in case she lies on them, they need warmth urgently. Put on warm sweaters and place the silver one inside the inside one next to your heart. Do you have a heating pad? Heat vents? As you know, they need to be in a very enclosed space and a heated one. Use the smallest box with woolies inside and place by or over a heat vent. The kittens need kitten formula because cow's milk will give them diarrhoea, though what they told you to feed them is better than nothing at all. They need to be given fluids every couple of hours at this stage - and you are going to be up all night again! If they seem distressed - gassy, diarrhoea, etc. from the formula you have at present, switch to warm water. Nourishment is not as important as fluids and warmth at this point. You will have to borrow money tomorrow to buy some kitten formula, unless Snow starts feeding them. Hopefully, she will come out of the anesthetic haze by early morning and will start nursing.

Good luck! We are all pulling for you, Snow and the kittens.