My cat has been given a steroid injection as she is really sick
I won't go into the details but I was wondering how long it takes
to do anything. She had it 2 hours ago and it hasn't seemed to
have done anything
I should have asked the vet but I was a bit shocked at the time
My wee boy gets them every month or so for his asthma. Usually he has stopped coughing before we left as vets. But a couple of times they have taken hours to work. If she is still unwell your best bet is to phone the vet - if it is serious I would consider phoning now.
It might give her more time with you so it is worth trying the steroids. At least you know that when she has suffered enough you are able to end her life and not allow her to suffer.
I hope that your short time left together is enjoyable and filled with love.
I am very sorry to hear of your bad news. Even though we know that there time here on Earth is short they make a big impact on the lives of those who love them.