(((Hugs))) sounds like she was OT by bedtime doesn't it?
I'm not sure, but I wonder if a little change in your thought process from 'have to settle her' to 'allow her to settle' might help? As LOs get bigger they are often better off with us doing less to settle them, so maybe you just need to be there for her with soothing words and a touch if needed, rather than feel it's your job to 'make' her go to sleep? I don't know, just rambling probably! She is at quite a typical age for separation anxiety right now, we had a hideous time with DD around this age taking up to an hour of screaming to go to bed. Do you notice any signs in the day?
If you're going with the idea of set naps then you do need to commit to them consistently for a good week at least to get them 'set'. So that would mean taking her in at the same time every day, and persisting in settling her to sleep for a good 45 mins at her designated 'nap' time. Then if no nap happens (as can sometimes occur when starting out with a new routine or sleep training), ideally you should keep her up until her next planned nap time and try again then. It's tough though and can result in OT quite quickly, not all babies will get along with it, but then again you can end up OT with any routine!