I think she just crashed for that second nap - it was a really long A after a short am nap, so she woke OT after 30 mins but could be resettled.
The average for this age is around 3 hours or a little more. A time includes settling time so here:
W/BF 7am
Solids 9am
A 3hr
S 10am (950 quiet time, in crib at 10, 1010 asleep)
that was actually a 3hr10 A. And an UT waking then, do you think? But for the next nap I wonder if she was already OT when you first put her down - so perhaps aim to have her in the crib 10/15 mins before you expect her to be asleep.
I would stick with 3hrs for another couple of days. If still 40 min naps, increase to 3hr15. In the meantime, reduce the next A to 2hr45 or so after a short nap. But if the morning nap is long, do that same A time again. Does that make sense?
Today will be interesting as we have swimming class right in the middle of 1st nap time so I'm going to have to get her down early even if only for a short one. Everyday is so different!
And on days like this, just reduce the next A if you wake her early from her nap. My LO always slept really well after swimming though
It helps if you can have a similar routine most days and then it's fine to have a day or two a week where you have an activity which changes her nap times.