Short Naps

My daughter is 22 months old and she’s on a 6:30a-7a to 6:30p schedule. She naps around 12:30p right after eating her lunch. But lately she’s been only napping for one sleep cycle, around 30-40mins. She wakes up crying. She used to nap for around 1.5 hours about a month back. I don’t know why she’s just not wanting to take her usual nap and wakes up crying. When she wakes up in the morning around 6:30a-7a she’s more calmer and rested.

Please advise what we need to do here.

Thanks.