DD2 is 15 weeks (or 9 weeks corrected due to being 6 weeks early). How many feeds and sleeps should she be doing?

Currently we feed 4 times in the day and she sleeps all night. Yesterday her feeds were at 8, 12, 4 and I woke her at 830. Her last feed she was sleepy and would 'wake' for it. She is breastfeed but does get a small top up at night. I then had to wake her at 8 this morning for a feed. After her 4pm feed she is a nightmare to get back to sleep.

Can she go longer then 4 hours in the day. Maybe feeds at 8, 1230 then 5 and down for the night?

From memory I used to feed DD1 at 430/5 and she went down for the night till 7/8 in the morning