I have no idea about the sulfur smell.
How is her amount of output? My ds had EBF poop that color around her age. His output was ok but barely adequate. He took quite a while to start gaining. He was just not eating enough. For him this was due to sleepiness/mild jaundice/poor latch.
His poops are now more of a normal yellowish color now that he is gaining well.
I am not trying to say your DD is not eating enough, just something to consider.
Also, what color is your pumped milk? At that time when my ds's poops were more orangey brownish my pumped milk was pale yellow. If he spit up it was bright yellow sometimes. (Now my pumped milk looks more white.) Milk could be many colors and be just fine.
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Ann, Mommy to 3 beautiful, boisterous boys:
Liam - 6 1/2, Emmett - 4, almost 5
and Callan - 22 months