Ok, so if you space your naps out reasonably evenly, your day might look a bit like this:
8 - WU
11 - Nap
3:30 - Nap
8 - BT
That would be ~3hr A times which may not be enough once she's had her sleep a bit more sorted but for a start, it should be ok. The next move could be to something more like this:
7 - WU
10:30 - Nap
3:30 - Nap (this could then be capped shorter as BT gets more tricky with UT)
8 - BT
Shush/pat is great, I still do it with DS at 4 when he wakes in the night. Just stroking his head or patting his back helps him settle back to sleep and when he's recovered from illness, he's back to sleeping properly again.
WRT helping her learn to roll back over, it can help to turn them half way and let her go the rest of the way - just to start the thought pattern in her head.