What I wanted to know is if shush pat is the right thing for all babies?
Like pp said and from what I've seen, no it's not. Babies with reflux, for example, can actually be MORE bothered by shh/pat. Some babies like a certain kind of shh (or no shh) or a certain kind of pat (on the bottom, no pat at all). If you think it overstimulates her, try a different version. See what works for her to help her calm down--that's the most important thing. Tracy suggested shh/pat because LO's can't concentrate on the crying, the shushing and the patting all at once, and eventually they stop crying. If you can find something else that she can focus on...maybe she likes white noise or soft music?...I say, try it!
Now, re: that 15 minute nap...young infants still have a strong moro reflex and they jolt as they drift to sleep. When the jolt is big enough, it can startle them awake, then they're OT, and have to go back to sleep again (another 20ish minutes of drifting off). Plus, if she's OT or OS, those jolts can be more disruptive. Using the swaddle helps, but if you know she startles awake easily even with that, you might try staying with her for the first 20 minutes or so, applying gentle pressure to her arms and legs so that they don't move as much.
HTH!