Growth spurts don't really last that long. Are you sure she's hungry that often in the day? Could her fussing or crying be from being overtired or anything? List your full day routine, it might help. What is her weight gain like? Proper # of wet diapers? Latching well? Do you pump? Is your lo strictly bf (no formula, no solids)? Do you feed both sides?
At that age my dd always woke at 1 and 4:30 for a feed, it's normal for bf babies to still have night feeds. From what I remember, she had a gs at 3 months and fed non-stop through the night, perhaps your dd is now starting a gs causing the nws last night. Without knowing all the answers to the above questions another posibility is that your lo is feeding so frequently that she's not getting to the hind milk (the fatty good stuff) so she's getting hungrier quicker as she's becoming a snacker.