Looks like the A time is too short. Remember at this age you are looking at 2hrs awake/activity time between sleeps. Time from morning WU to first nap, from end of first nap to next nap and so on. In these EASY samples I see an A time as short as 1hr 20 which is very short for this age and likely to leave her UT and unable to sleep properly.
I think you said you were going to aim for 3.5hrly E, if she is not interested in her milk at 3hrs you can take her to 3.5hrs.
I would suggest watching the clock for a few days, give her a 2hr A time between every sleep and increase E to 3hr 15 or 3hr 30 ...this is the time most LOs stretch their E time to 4hrs, a few babies don't stretch but that would be obvious by her clamouring for the milk rather than being disinterested.
Over the next month her A time is likely to increase to 2hrs 30, so I wouldn't delay on this increase to 2hrs now, it means you can increase again in a few weeks to 2hr 30 and then to 3hrs around 6 months. The A times stretch quite a lot.
Hope this helps