at 4 months there are usually some developmental milestones - in addition to the cold - and it very frequently disturbs sleep. the good news is that with lots of practice, your lo will get over it. the bad news is that until she's satisfied, you have to ride it out. if she was feeding once before out of hunger, i'd probably stick to that feed, but probably wouldn't add extras unless she seemed to be truly hungry.
would definitely stick to the shh/pat - seems to be working for you. also, if she's stuffy & having trouble breathing, elevating her mattress at one end can help wonders; just stick a couple blankets under one end.
good luck & HTH