At this age, it takes about 25-30 mins for them to deep sleep, and full sleep cycles are about 50-60 mins until 6-9months. I think the transition starts around 4 mo and can be a cause of sleep regressions around then.
To wean sh-pat for you, I would start by removing yourself from sight as best as possible. So, you can sit on a chair next to the crib with your arm in through the bars and your head down. After a couple nights of that, you can start reducing both the sh and pat parts... quieter shhs until you no longer are, and slower pats until it becomes a touch. And eventually, until it becomes such a light touch, she may not notice. Probably takes about a week or so. If you feel she is doing well with it all, you can try putting her down one day very gently with a hand on her, then lift and leave the room. If she lifts her head, wait to see what happens before re-entering... she may put her head back down... or if she starts whimpering or crying, go back in and without a sound place a hand. Always do the last least thing you tried... so if you stopped shhh and just patting, just pat when you go back in.
Hope that helps!