Mama's I'm desperate!

My girl is 5 months old and exclusively breastfed but since Sunday (two days ago) she's been causing a huge fuss about eating time. She will be obviously hungry and when I put her on the boob she will continuously unlatch herself and just cry at my boobs. When the milk lets down she'll stay latched but it doesn't seem like she's eating a lot. I've even tried waiting longer to feed her, and I've also tried feeding her sooner just to experiment. I've even tried giving her distractions, etc. looking at a toy or Christmas lights while latched to see if it would distract her from fussing enough to stay latched on.

Ideas on why, mamas??