Yes 2x long A's with a short nap could definitely make her OT, esp at a young age. TBH tho, I've found with my DS he's better having the longer A in the morning & a shorter A time to BT, esp once the nap starts being capped.
If she is happy, not grumpy in the slightest after being woken & her mood seems fine & you don't feel she is OT, just stay with it. I've only just jumped in here at a late stage warning of OT & like Kaydee says, maybe she is just LSN. If she starts to wake repeatedly after bedtime or gets very tired out/upset during the day & looks tired, or if her nights shorten again I would reconsider & try extending the nap again. Its only because I've been in a very similar place to you, & started capping at quite a young age & it turned out I didn't need to & we hung onto the 2hr nap for 5 months longer.x