Hi,
The aBA helpline is open 24/7 - so no need to wait til Monday! You can ring any time.
this is nothing to do with the whooping cough immunisation - but probably has a lot to do with the jaundice. Jaundiced babies are often sleepy and disorganised. You will find that she changes dramatically with frequent feeding, as the jaundice passes.
Make sure your little one feeds at least every 3 hours - both sides. You may find it useful to do breast compressions when she is feeding. This often keeps babies awake and interested for longer. While she is feeding, press the flat part of your fingers inwards and downwards on the breast - almost as though you are expressing into her mouth.
Usually it is pooey nappies that give the best indication that your baby is getting enough milk - and after day 5 she should be doing several per day.
Let us know how you are going