Transition to 1 nap

hello!

2 weeks ago we started the 1 nap transition for our 15 month old baby.

She wakes up usually at 6 and sometimes sleeps back for 1h after feeding. Then she naps at 11.30-12 but the issue is that she is not sleeping for more than 1h and thats it until bedtime at 8pm.

I feel that this is too little since she used to do a total of 1h45 split into 2 naps previously!