Hi there,
so she is on 3h A times? It sounds like she is ready for more and that would hopefully will increase the length of the nap. When you increase A times it's better to increase it slowly, so 10-15min every 3 days and stop when you see the naps are ok. Of course every baby is different and some need more than 3 days, some need smaller jumps than 10min and of course don't push it to be 5h A time or something!
I also wouldn't do Shush-pat anymore, at this age they often find it more stimulating than calming. Have you considered using PU/PD?