D.
It's totally normal for a breastfed baby to wake up after four or five hours! She probably needs to be eating then, so don't feel like you're doing it as a "last resort" kind of thing. Breastmilk is digested so much easier than formula so that's why she's waking up. I'm right there with you. My son is waking up two or three times a night. We just started solids with him so I'm hoping that will make a little difference.
The most important thing I can tell you is to not compare your baby to other babies, especially formula fed babies. Each baby is different. If I were you, I would just feed her when she wakes up and put her back down to sleep.