How did you get on? I would probably stick with a shorter nap after a NND, but seeing as you're at the start of the 1-0 it'lll take a bit of trial and error I expect. It sounds like she handled the NND really well though
If you're doing NNDs more often you can experiment a bit with nap lengthen the following day. If you had a short night after that long nap, that probably says that you need to try something shorter as a recovery nap next time. If she had a long night after that long nap then probably you got it spot on
We started off doing uncapped naps after NNDs but J will only sleep up to 11.5hrs in 24, so it wasn't long before the naps were taking away from the nights and leaving him more OT overall.
WRT how often to do a NND, I'd move your nap a bit earlier and let her lead the way if you can. If she's not tired, then she won't nap, so you get a NND. If she is, then she'll nap earlier and you get a nap day. Having said that, J needed more direction as he'd EW if he napped too early or too late, so we ended up with a really small nap window which he would more often than not nap in, and then take ages to setttle at night / EW. So with him I started off with a NND every 2-3 days and increased to every other day, then every 2 days etc., until naps started giving less sleep overall in 24 hours, at which point I stopped offering a nap cold turkey. Basically, as soon as he started taking longer to settle at BT, or doing a shorter night following a nap day I increased the frequency of NNDs so we were maintaining 11hr nights as a minimum. Does that make sense?!