Do I just carry on until we start getting problems?
Honestly, this is what I would do
If it ain't broke, don't fix it kind of thing
Her naps look good to me, as does her night sleep. She had that one NW a little bit ago, but it doesn't sound like it's a pattern (which is when you know there's an issue).
Because you've had experience with the long NWs due to her needing an A time increase, I think you are the expert here, already knowing the signs for when she's ready for more A time or what those NWs mean if they start happening consistently again.
Now, I guess I should ask: is she just as happy after a 10.5/11h night as a 12h night? If yes, then I think everything is fine. She might be one of those amazing LOs who makes up missed daytime sleep at night (like when she has short nap days, but that 12h night).