afternoon nap

ive been struggling to my 22nd December baby to take her afternoon nap the past 2 days she has a morning nap around 1030 for 1hr-1hr20 then normally sleeps again around 230-330 for 30 minutes but she looks asleep or sleepy then wakes as soon as shes put into her cot for this nap so she is then awake until 8-9pm at night which seems far to long to be awake from 12-9pm its been 2 days in a row now anyone else had this problem i tried at 3pm for naptime and against 445pm but its not happening.