I would wake her not only b/c it is important for her to get calories and nutrition, but it also helps her learn to differentiate between day and night sleep. You can give a leway of 30 mins or so, but do try to get as many feeds in during the day. My dd never woke up herself in those early days, even at night. I had to wake her, then put her straight back down. At 2 wo, feed her as many times as she wakes in the night, and she'll gradually stretch out her feedings as she gets older.
Shh/pat should be used if your child is crying when going down for a nap. You can find much more info on that on the Sleep boards, probably under Naps.
HTH, and congrats on your new lo!