4 month old post flu sleep regression

My 4 month old caught the flu last week and has been slowly getting over it. Once she started feeling sick her sleep obviously took a turn. She was previously doing 7am-7pm and now that she seems to be feeling better, the last 2-3 nights she has been up every 2 hours like clockwork. I am at a loss and losing my mind as I am also getting over the flu and haven't had a full night of sleep in a week. How do we get back on track to our 12 hour nights?