Wake windows

How do you know when to extend wake windows? My girl is 9 months Friday and our currently schedule is the following:

Awake-6.15/6.30am
1st 9.15/9.30 for 1 hour
2nd nap 2-3.30 for 1.5hours
Bedtime 7.30pm

3/3.5-3.75/4 WW

She knows how to fall asleep herself but sometimes need a lil extra help for 2nd nap. We are also battling a 5/5.30am wake very morning but we have to put her back to sleep with a contact nap till 6.15/6.30 so was thinking would extending wake windows help with that in any way?