Great sleeper at night but doesn’t nap well

My 13 week old has always been a great sleeper at night. She sleeps from 6pm-7am. She normally wakes up around 3:30am-5am, will have a bottle and go back to sleep until 7am. Sometimes she sleeps all through the night. All of that is wonderful and I’m grateful however she takes very short naps throughout the day. She use to nap really well too but at most she’ll nap for maybe an hour and a half straight now. She mainly naps for 40 minutes here and there.

Does anyone have any suggestions on how to get her to take better naps? She gets so irritable by the end of the day and it’s hard to get things done.

Thank you!!