She poops during nap time

[Sunflower]

the tittle says it all
She usually takes 30 minutes to fall asleep but for the last week and a half she won't sleep until she has pooped ,which is almost an hour after I put her down for her nap.
Is there anything I can do ? I would really like her to nap at the same time as the others and nap time is the only time I really have to clean up the place etc. Since I stay in the playroom until everyone is asleep that doesn't give me much time to do everything I need to do before everyone else starts to wake up .