Nap troubles 😴

My LO just turned 5 months today and the last couple of weeks she’s been giving me the hardest time with taking naps. She sleeps good through the night, from 8pm-7am and then she’ll go back to sleep after a feeding until 9-10am. Throughout the day I’m lucky if she sleeps more than 20 mins! She’s so fussy because I can tell she’s tired, she rubs her eyes and cries, but when I try to put her down for a nap she just won’t go to sleep. This is so exhausting and by the end of the day I can’t wait for her bedtime. 😩 What can I do to help her take longer naps??