You are definitely doing the right thing, infant led feeding is the way to go! I say go by what she wants, you'll know if she's hungry or not LOL! Depending on Seth and his tummy or the amount of sleeps he has I can often feed hourly to as you say 4 hourly (even 6-8 hrs overnight). I just basically try and tick all the boxes, are they tired (are there cues/), dirty nappy, bored, wind, hungry... etc. Thats the best you can do They eventually settle into a routine... Don't know too many kids that eat every hour on the hour!

*hugs*
Cailin